How to drill out a broken tap | drill out a broken screw extractor

By Grover Koelpin 100 comments

in a previous video I demonstrated how
to use one of these which is a guide that I’ve used from a bolt by drilling a
hole down the center I will put a link in the description to that video and
also the video on how to make one of these guides this video have got a bolt
which is shared in this hole and what I’m going to do is I’m going to
shear off a tap in there and then we’re going to try to remove the sheared tap
I’m now going to put the guide in which I’ve made then I’m gonna tighten up the nut at the back there so I’m just going to drill that out with
the correct tapping size drill I’m just going to swap over there to a
cobalt drill bit so I’ve now drilled a hole I’m now going to break
the tap off into the bolt obviously that’s broke and it really bad
place it’s not where I wanted it to brick so I’m just going to give it a
helping hand you can see that has broken off and that is much better we’ve
now actually got that deep in the hole not only have we got a broken bolt in
there we’ve now got a broken tap in there as well
taps are made out of a similar steel to a screw extractor just a word of warning
about screw extractors / taps etc they are made from a very tough steel
but it is very brittle it’s absolutely critical that you were safety glasses if
you’re attempting to deal with something like the may break the shards that
actually come off that when it breaks are actually like splinters of glass
and they will quite easily embed themselves into your skin or your eyes
so it’s absolutely critical to wear safety glasses so at the bottom that you
can see there’s a tiny piece of the tap and that is going to stop me from
getting the guide in properly so I’m going to try to break that off and that
I’ve actually cracked off normally in situations like this you ever get a
broken screw extractor or a broken tap both of these are very hard steels and
they are incredibly tough to drill out you can’t actually drill these with a
normal drill bit you have absolutely no chance you could possibly use a carbide
drill bit like that but these are very very brittle you have to be very careful
with carbide they will drill tough steels but if you break one of those it
is very difficult to get it out probably one of the only ways to get that out is
to have it spark eroded afterwards you could use these to drill it out
these are made by ARTU and these are multi-purpose drill bits these will
drill virtually anything but as you can see a few of these are seriously
battered especially the size which I’m going to
need which is about five or six mil you can see that that is absolutely no use
whatsoever now so I can’t actually use them so that’s one of the drill bits
that we’re going to be using which is a JCB Diamond-tech hole saw
they have impregnated with diamonds on the end that is one that I’ve used
previously to drill 60 holes in a Granite tile and I also used that to
drill a tap a few days of weights to put that in the vise that is it grew up in
tap and actually managed to drill through that using this hole saw this
kind of Steel is incredibly tough it is very very difficult to drill it you can’t
actually drill out using a normal drill bit or a cobalt drill bit you have
absolutely no chance so I’m going to take the drill guide that I’ve made and
I’ve actually made a short version of that so I’m now going to tighten the
drill guide in there to drill out the broken tap I’m going to use that one, which
is a 6.5MM diamond hole saw that as a perfect fit in
there and eventually we should be able to drill out that broken tap so I’m now
going to dip this in some water I will keep dipping that in the water every
five seconds so this is going to be a very long process but it is one of the
few ways we can actually drill out a tap and I’ve just actually removed the bolt
so we can actually see and you can see that in there it is actually cutting the
tap away I have to point out this is a very slow process and if you can do it’s
much easier getting its spark eroded but for a lot of people that is not an
option obviously this job is very
time-consuming and I’ve been drilling that for about 30 minutes now and we’re
approximately halfway through so I can’t stress how important it is when you’re
doing something like this to go and take a break you do not want to let a job
like this get on top of you it’s important to go out have a cup of tea
going up something to eat etc never let a job like it’s wind you up or
you’ll just end up getting mad with it and rush it and end up breaking
something to apply this can’t be rushed you really do have to take your time
with them on that note I’m going to go a cup of tea we’ve got far enough in that we no
longer need the guide bolt so I’m just going to remove that and I’m going to continue to drill I’m actually just going to change the
drill bit over now that one has definitely had a lot of wear on the end there
but I’m sure that will still go through a porcelain tile or a granite tile
however I’m going to swap over to a brand new hole saw and we’re going to
see if that will continue cutting and we’ve actually just got the tap stuck in
the end of there now so we’ve actually cuts the core straight down the center
of the tap I do have to say that now did take a while and it was probably
drilling that for a good hour or so but we’ve now got the broken piece of the
tap and we’ve got a hole down the remainder of the tap which is approximately so
long so now we have a chance of getting the broken tap out and the bolt that
is still stuck in there so that’s the piece which is approximately one inch
long and if you now look in the hole you can actually see that we’ve successfully
drilled out the broken tap we now just need to drill out the remainder of the
bolt so drilling that out will be very easy I was going to use this screwdriver
I’m just going to use that to get the depth of the hole and then I want to
transfer that onto a drill bit because we don’t want to drill too deep so I’m
now going to take some cutting paste and then I’m just going to drill out the
remainder of the bolt that’s in that hole now we’ve done that I’m just going to clean
the hole out. you can then take an M12 tap then apply some cutting paste onto that and I
will proceed to re-tap the hole I’ll then just give the tap a clean I’ll
just clean out the hole and then we’ll just proceed to tap the hole again It’s important that you don’t try and rush any of this
the last thing you want to do now is break off the tap. you have to be aware
that there is some steel left in the threads in there and we’re actually
trying to break out those bits of steel and re-tap the aluminium so you do
have to do this very carefully and very slowly if you take a look on there you can
actually see some of the bits of the broken bolt so that’s why it’s important
to keep stopping to clean out the hole obviously if you’ve got a compressed air
supply it’s a really good idea just to give that a blow out and get any of the
debris from within the hole well that hole is now clear I can now
take an m12 bolt I can screw that in there absolutely no problem at all, it’s actually gone a bit tight just wind it in the rest of the way using the
spanner you can see that will hold absolutely no
problem at all I hope you found this video useful if
you haven’t done so already please subscribe to the channel



Oct 10, 2018, 12:38 pm Reply

One point to bear in mind is doing that on an engine block. There is a risk of the swarf from the drilling out to end up in the engine somewhere. Potentially not a good thing. Less of a problem in a scenario like the demo where the casing is off the engine on a workbench.

Still really enjoyed and appreciated the video though 👍👏

Dan Moreton

Oct 10, 2018, 12:44 pm Reply

Thanks for another quality video. Your step wise approach to a difficult task is a lesson for all of us!

عبدالمحسن الجبوري

Oct 10, 2018, 2:19 pm Reply

very very good

Dave White

Oct 10, 2018, 3:04 pm Reply

Thanks Chez
Again those bits are really impressive! It's certainly a way out if you're stuck like that.
But that "click" when the tap broke. Still makes my blood run cold!
I can still hear the bloke who taught me fitting!

Rick Alwaysprepared

Oct 10, 2018, 3:24 pm Reply

You've the patience of a saint


Oct 10, 2018, 3:33 pm Reply

You make it look so easy! It always helps having the right tool. What was the other expensive drill bit you could have used? I missed it as you said the name fairly fast.

JON Gergeceff

Oct 10, 2018, 3:51 pm Reply

Great job

Thpxs05 Thpxs05

Oct 10, 2018, 4:23 pm Reply

Great work quality engineering. The guide bolt is a great idea to save from running up the side of the break. Have you got a video on heli-coil thread inserts. Thanks for the time and effort you take with these videos. Regards….Paul

Tommy Mckay

Oct 10, 2018, 5:13 pm Reply

Sometimes you can get lucky using a left hand jobber. Depending on the material to be drilled of course.

Lincoln England

Oct 10, 2018, 6:48 pm Reply

Great video yet again….As a compulsive fixaholic I love to see stuff coming back from the grave…..I've spent a tenner to fix stuff worth a fiver just because I can! Keep up the good work!

BuildiT – DIY Israel

Oct 10, 2018, 7:05 pm Reply

could not agree more about the necessity of taking a brake… I had to drill a 13 mm hole in my kitchen granite counter-top, with a standard masonry drill… my muscles still ache, and this was a few days ago… I did not take a brake… did not buy a special drill like the one you are showing here on account of the price and the fact that it was going to be used just this 1 time. even though it is expensive, should have bought it… a Chinese, low grade one costs about 28 pounds where I live, and it is a lot considering the currency. anyway, lesson learned… the hard way…


Oct 10, 2018, 7:06 pm Reply

Excellent Video as always!

Paul Morrey

Oct 10, 2018, 7:17 pm Reply

Great video Very useful Thanks

John Hughes

Oct 10, 2018, 7:21 pm Reply

Purgatory for engineers!

Osvaldo Cristo

Oct 10, 2018, 7:39 pm Reply

Thank you. It looks it did not occurs only with me! Great to feel not alone! :-0

BTW I use counterclockwise bit rotation and left twisted bit in the hope the screw goes outwards alone… it worked a couple of times.


Oct 10, 2018, 8:03 pm Reply

You're doing a belting job pal. Appreciate all your efforts just for us!

Could I just add, would it be a good idea to drill with the diamond hole saw in reverse ? You never know it might just bite the lot and wind the broken bolt out :p

Tony Sharp

Oct 10, 2018, 8:54 pm Reply



Oct 10, 2018, 9:19 pm Reply

Do have links for the tap/die set, screw extractor set and left hand drill bit set you use? Thanks.


Oct 10, 2018, 10:25 pm Reply

I think this is one of your best presentation. Lots of excellent ideas. Thanks for posting.

Graham DIY

Oct 10, 2018, 10:32 pm Reply

As always, great video 👏👍

In particular, your advice to “take a break” and “not to let it wind you up” is superb advice for someone who is learning about any jobs really.

Finally, I’d never even thought to use a “diamond tile hole saw” to drill out metal. I know I know, some will say it’s “obvious” – but it wasn’t to me. So thanks 🙏

ken Wheeler

Oct 10, 2018, 11:17 pm Reply

How come you were not keeping the drill steady? Were you deliberately wallering out hole or is this just out of habit?


Oct 10, 2018, 11:47 pm Reply

Only recently found your channel and have learnt so many things already. Very professional and practical advice to match. Thank you for your efforts!

Kevin Behr

Oct 10, 2018, 5:18 am Reply

I was surprised to see the JCB hole saw was an affordable tool, must get a couple of sizes, another excellent video.

Kevin Behr

Oct 10, 2018, 5:23 am Reply

Just a query, in this instance might it have been worthwhile turning the casting on it's side and creating a plasticine dam around it so you could keep the drill immersed in water, or even putting it in a bath of water

Mosizlack Monarrez

Oct 10, 2018, 6:13 am Reply

The tap inside of the hole saw gave me so much anxiety..

Jack King

Oct 10, 2018, 9:32 am Reply

The secret is patience and take it easy.

Michael Streets

Oct 10, 2018, 10:45 am Reply


joel blauvelt

Oct 10, 2018, 2:39 pm Reply

Nicely done. Thank you!

Dash Cam Das

Oct 10, 2018, 4:27 pm Reply

Why use water(other than to cool the bit)(or have I just answered my own question) and not cutting paste or wd40 to lubricate the bit?

Jim H.

Oct 10, 2018, 4:46 pm Reply

Thanks for a very informative, useful video!

Stefan Wojtowycz

Oct 10, 2018, 11:46 pm Reply

Hi, surely after diamond drilling the tap it would have been better to have used a left handed drill. This would have shifted the remaining outer diameter of the tap by unscrewing it.?


Oct 10, 2018, 2:03 am Reply

A difference question.
What do I need to buy and cut photography's lens filter in sizes of 24mm X 36mm & 8.8mm X 13.2mm?
After cutting in fine, how would I file down for it to be smooth?
These are made of glass.

Alan Weir

Oct 10, 2018, 3:57 am Reply

Brilliant video, I would have give up. That must have taken you forever to do. Well done.


Oct 10, 2018, 8:10 am Reply

Thanks for demonstrating a procedure which most of us try to avoid but sometimes you have to do it. As you showed, it's very time consuming and patience, care and persistence is essential.

tom thompson

Oct 10, 2018, 8:30 am Reply

at 2.05 i could cry ,,,, been there done that ,,,

Smarter Than You

Oct 10, 2018, 12:53 pm Reply

Another excellent and very informative video, detailing the difficult and tedious task of removing a broken tap!! The JCB Diamondtech hole saws do not appear to be available in the US, but I am sure there is a suitable substitute. Something I have noticed over the years is inexperience persons attempting to tap a hole using a Crescent wrench (adjustable spanner). This not only greatly increases the opportunity to break the tap, but will also produce oversize threads due to side loading the tap. I DID notice that you use a proper tap handle, which is always recommended, even when merely chasing dirty threads….. Thanks for another GREAT video…

UK Tony

Oct 10, 2018, 10:49 pm Reply

The sound of crying when you broke the tap was me. Very, very impressed as I have always considered a broken tap deep within a stud hole as being an unrecoverable situation. A HUGE thumbs up.


Oct 10, 2018, 8:16 am Reply

Great video, have been watching for a while now. I am trying to emulate what you do so would appreciate any advice you can give me on my future uploads. Please head over and have a look and let me know what you think.

Lily Lou

Oct 10, 2018, 2:54 am Reply

Hello. Can I please pick your brains? I’m looking for a good cordless drill and yours looks great; can you please give me the details? Thanks very much 😊

nasser d

Oct 10, 2018, 3:00 pm Reply

It would of broke in the perfect place first time, if it was a genuine job that you was in a hurry to finish. Yet takes a lump hammer when trying to demonstrate, 😉

Barrios Groupie

Nov 11, 2018, 10:42 pm Reply

could you do a video on how to get hold of a competent handyman like yourself?

Hayden King

Nov 11, 2018, 9:05 pm Reply

I have seen the drill you use in this video in a few of your other videos and I was wondering how you rate them (AEG) in terms of quality and value for money


Nov 11, 2018, 3:41 pm Reply

Excellent video! Learned something today!👍

Peter Smith

Nov 11, 2018, 11:31 pm Reply

Thank for so much for this – great video full of really useful advice. Two quick questions:
1) Can you use the Diamond Tech Holesaw in both directions? Just wondering if you can use a reverse (counter-clockwise) rotation so that you maintain the possibility it might catch and wind the fastener out.
2) What product were you using (in the spray can) to clean out the hole as you were cutting with the Diamond Tech saw?
Thanks again.

meric cumin

Dec 12, 2018, 4:37 am Reply

Wow! And I thought I was crazy – not even close! Actually doing that just to help some total strangers out is quite mind boggling. I believe the term is 'Gobsmaked' lol. And yet I see some thumbs down! What the hell is wrong with people. If someone's content bores you, DON'T WATCH IT. The idea that someone would give thumbs down on something that took many hours of extremely difficult work to accomplish – just to help out other people – is a sad comment on our society. And I guarantee that anyone that 'thumbs-downs' this is a total loser in life.

juan Carrera

Dec 12, 2018, 7:44 am Reply

Just drill it out !

Поливанов Владимир

Dec 12, 2018, 8:54 am Reply

Весьма познавательно. Спасибо за настойчивость, умение и аккуратность в работе!


Dec 12, 2018, 5:47 pm Reply

Thank you for the video. You are a true craftsman.

Chris M

Dec 12, 2018, 1:10 am Reply

I knew an old school cylinder head rebuilder. he would put the cylinder heads in a kiln. when they cooled off, the broken bolts would come right out.

Dain Smart

Dec 12, 2018, 3:11 pm Reply

Will the cutting paste blunt your drill bit /tap at the same time?

S. C.

Dec 12, 2018, 5:00 pm Reply

Love the alternate but understandable English "Buttered up" rather than buggered up. Amazing hints. Ive run into this and just over sized the hole but this is better

Artur G

Dec 12, 2018, 2:56 am Reply

That cup of tea before the job gets on top of you makes the difference between smashing the whole piece, and continuing with the fine, slow and relentless spirit. thanks

main mast

Dec 12, 2018, 7:11 pm Reply

the drill guide is brilliant. if not commercially available, you should market them. fascinating vids for an old wrenchbreaker to see from across the puddle.

James Hanoomansing

Jan 1, 2019, 3:18 pm Reply

very skilled work…thanks for sharing

Serg Gannoshin

Jan 1, 2019, 8:46 pm Reply

Шаман однако! LIke!

David Martin

Jan 1, 2019, 6:25 am Reply

Why do they say aluminum the way they do?🧐

Tony Nicola

Jan 1, 2019, 7:11 pm Reply

I second the comment on marketing the drill guides…..I would be your first customer!

David Hunt

Jan 1, 2019, 8:04 pm Reply

Thanks very interesting keep up the good videos

Axa Axa

Jan 1, 2019, 3:19 am Reply

all the trouble to left handed drill in your other extracting videos, then you right hand drill with the hole saw that could easily have worked left-handed…
and what's with the 'cutting paste' you want to evacuate those chips rather than having then stick around and help dull or better yet snap your cutting tools

Bobber 55

Jan 1, 2019, 12:33 am Reply

I believe I would use water in a spray or squirt bottle rather than dipping that diamond bit into the water tray that would also help flush out any steel particles.

Troy Davis

Jan 1, 2019, 2:42 am Reply

Hi there. Great video! I had a similar issue, with a bolt for my thermostat housing on a 1998 e320 benz. Instead of the tap breaking in the hole the head of my screw extractor broke off. Do you have any ideas on the next step to remove the broken extractor, then try again to remove the broken bolt? By the way, the problem initially started with the thermostat housing bolt breaking 1/2 off when simply trying to unscrew the bolt. I was able to drill a hole pretty close to the center of the bolt using a left-hand drill bit then using the extractor. I had also been using penetrating spray.

Adrian Gatter

Feb 2, 2019, 8:54 pm Reply

Nice work. When tapping try cycle half turn in and quarter turn out, the swarf should come out the tap channels without you needing to clean the tap.

4X4 and jeep adventure Club Rawalpindi Pakistan

Feb 2, 2019, 6:14 am Reply

Always great work
Thanks for sharing

Bill El Hassan

Mar 3, 2019, 9:29 am Reply

Love your work and your patience. Wondering if you have any tips for removing a tap deep inside a hole about 100 deep. I was attempting to tap a hole in a broken diesel injector to thread a rod and pull it but broke the tap about 5mm in. Diesel injector are made of some seriously tough steel

Jason O

Mar 3, 2019, 11:27 pm Reply

I think you just saved my life!!!!

Back Down On The Boat

Mar 3, 2019, 8:39 am Reply

you're a lifesaver!

I am Joe

Apr 4, 2019, 2:27 pm Reply

Magnificent video. Even without the comment about the time it took to film, edit, and upload I knew it was massive. Thanks for passing along the knowledge.

Most folks wouldn't expend this sort of effort I'm afraid…I can see these skills having their place when repairing antique or classic cars/machinery, when it's not possible to simply source a new replacement part.

I'm currently dealing with an amazingly recalcitrant remainder of a spark plug shell. It's resisted just about everything I've tried. Specialized extractors are on their way…fingers crossed that they work.

david wrighton

Apr 4, 2019, 12:56 am Reply

cutting skin and flesh with a scalpel is not as skilled—-but gets more kudos points

Henry Roman

Apr 4, 2019, 3:14 pm Reply

It's frustrating trying to understand people who can't speak English clearly, if this video was in Spanish i could probably understand it better and my primary language is English


Apr 4, 2019, 9:55 am Reply

If you had a large LH drill would you have used it here?

Patrick Chamberlain

Apr 4, 2019, 5:59 am Reply

I have a tap stock in my GM motor block 5.3….I seen that alum will disolve the steel and leave the aluminum alone


May 5, 2019, 12:22 pm Reply

nice vid! got a shitty drill broken off in my exhaust, didnt think about grinding it out with a tile diamond bit…which i have……..gonna try this may have just saved my ass.


May 5, 2019, 6:53 am Reply

A good cupa is what keeps an army on th march!
Outstanding job.

mark mcvord

Jun 6, 2019, 12:08 pm Reply

You are a life saver, this video got me out of a real problem 👍

Pierre Augustin

Jun 6, 2019, 2:46 am Reply

incredible but sooooo long! could you explain how to remove titane bolt in a 2 piece bbs RS722 rim please?


Jun 6, 2019, 5:37 pm Reply

great vid ..thanks for taken the time

Sharif Sircar

Jul 7, 2019, 5:06 pm Reply

Taking a break is a very good tip

Stuart Helliwell

Jul 7, 2019, 7:06 pm Reply

Sorry but I just can't help myself commenting on this clip anyone who has managed to break a tap the size of the one he used as a demonstration should not be allowed within 50 ft of a workshop "he had to use a sodding lump hammer!!!" as an apprentice every tap I broke usually 2mm downward I received a hefty clip to the back of my head,,,,

farid tazi

Jul 7, 2019, 11:00 pm Reply

good job thank you sir

P Smith

Jul 7, 2019, 2:03 am Reply

Where do I get diamond drill bits in the U.S.A. for a poor man?

Olin Zuercher

Jul 7, 2019, 12:08 am Reply

When you deliberately broke off that tap!!! You pilot hole is still one brilliant idea, however it's usually my experience that bolts twist off about flush. That can be dealt with by welding on a nut, however that's only if you have a welder and have some experience welding. On another note; I've yet to see cutting paste here in the States, not that the States have any monopoly on good ideas. I've also not seen diamond holesaws, but perhaps that sort of thing is well known to Granite Kitchen counter [top] installers. In any case, seeing an alternate use for a tool is always enlightening.


Jul 7, 2019, 10:21 am Reply

I am stuck with the stupid problem that I broke off an exhaust bolt, then while trying to drill it out, I realised I had drilled the pilot hole off-center and now the thing has a lot of material left on one side, and hardly any on the other. Long story short, I either have to do what you did in this video, or use a tiny round bur and try to grind the bit that remains into fine metal dust.

steve c

Jul 7, 2019, 11:10 pm Reply

Would using a diamond tipped bit in a Dremel be any faster?

Ramon Bernabe

Jul 7, 2019, 11:31 pm Reply

I reckon while the tap was not totally broken, you should weld it with a piece of metal stick so that you can still hold it firmly and turned it easily. Rather than you break the tap which is give you a totally huge problem.

Danny Timms

Jul 7, 2019, 6:11 pm Reply

Much cheaper hole saws on Amazon, for example:
10 for $9 (about 7.2 sterling). I've used them, they work fine.
Skip the carbide drills, they're liable to break and make things worse, although you CAN drill out a carbide bit broken in a hole with the diamond hole saw… I've done it.
Thanks for these great vids! Love your thru-drilled bolt trick, and the hinge centering tool!

Compression Ignition Army

Aug 8, 2019, 10:22 pm Reply

Learn something new every day

Well done mate .

Well done

Player1 TV

Aug 8, 2019, 8:16 am Reply

Just snapped a 8mm 316 stainless bolt off, drilled it out to 6mm, stuck the easy out in and it snapped off flush. I watched 4 videos on removal options, purchased, drill bits, dremmel bits and spade type tile drills. They all broke. The only thing that worked was your tile drill bit. It seemed like it wasn't working after the initial sharpness wore off, so instead of going slow i just hammered it for 10 seconds at time, refreshing cutting fluid and it worked. Over all, 6 hrs of trying and failing, 30 mins of your method and success!! Thank you, one can stop swearing now.

Boyd Waters

Sep 9, 2019, 5:34 am Reply

I had a day like this…

like whatever

Sep 9, 2019, 7:54 am Reply

What about 3 mm tap or less?

Mike Ferguson

Oct 10, 2019, 7:20 pm Reply

Thank you so much for uploading this video. I broke an ez out off in a transmission pan bolt and was able to remove it using your method. Your knowledge is greatly appreciated

Joseph Stokes

Oct 10, 2019, 3:15 pm Reply

From here in the States we say thanks for an excellent video and we definitely owe you a brew!


Oct 10, 2019, 9:57 pm Reply

Diamond holesaw. Got it Thanks!

Fujiar 001

Oct 10, 2019, 7:44 pm Reply

Hi.Thanks for a great video!Can U give some info about the diamond core drill please?(i.e. make and supplier.Love your topics and am a new subscriber!

Fujiar 001

Oct 10, 2019, 7:46 pm Reply

I should read comments should I not!Apology,found what I`m after!

rob dog

Nov 11, 2019, 12:54 pm Reply

Really good tutorial and sound advice …… I screwed my shoulder and arm up by not taking a break and getting stressed out drilling through glass ……. stress is a killer

Karl Benz

Nov 11, 2019, 2:13 pm Reply

Great video. Thank you for the tips!

Chas S

Nov 11, 2019, 7:19 pm Reply

Always just walk away from frustration with a job. From personal experience, he's correct.

Chas S

Nov 11, 2019, 7:26 pm Reply

15:00: Snap ! "Somebody threw a spanner, they threw it in a hole".

Gilbert Brewer

Dec 12, 2019, 11:58 am Reply

👍👍 2 thumbs way up there. Good job !!! Hello from across the big pond

Theron Rose

Dec 12, 2019, 2:52 pm Reply

I have used a dremel bit that was tipped with diamond. Used it to hollow out a broken tap, then drilled it shattered into peices.

Leave a Reply