TTP HARDDrills 6mm Drill bit - Cobalt Hardened bits for Drilling Hard Steel & Stainless, Heavy Duty Universal Drills for Cutting Tough Metal, Professional jobber Industrial 135 Degree Point Metric

If you have a tough drilling job,,, these are IT, yes,,, they can break,,, but the steel that they make this drill out of has got to be hard to be able to cut into super hard steel like it doesl So yes,,, you might call them,,,, brittle,,, but they work fantastic, I carry a few in my wallet and when I run into a friend,, I give them one to try and dare them to tell me they can find better. definitely buying more.

I just used my new TPP 4.2mm bit to drill a hole into a stainless steel tube (to be used for a stair railing). The TPP bit worked beautifully. This is a terrific product at an excellent price.

These drill bits are the best! They are the only ones I can get that cut through stainless steel.

These cobalt drill bits did its magic, couldn't have done the job without them. My husband was drilling into titanium at work, and these drill bits were the ones to use, regular drill bits would have burnt up. An excellent buy!

Used them several times to drill out broken screws. They really grab and drill thru steel.

Really good bits. Maybe not as great as advertised, but still VERY good. The internet hype makes them look indestructible, which they are not. Drilling out good quality bolts definitely takes its toll fast.

They worked great they drilled out a wheel stud that I been trying to remove for a few w

As expected

picnic comes from computer support - "problem in chair, not in computer"having struggled to remove some metal bolts and then struggled again to drill the bolts out, a little research led me to these drill bits. All the reviews suggested that they are the best.but I was drilling away and making virtually no progress and thinking "this can't be right"I'm more used to drilling wood or brick - I don't usually work with metalso - back on line - - first lesson - my drill was spinning too quickly - just left on the faster of 2 settings - so I selected the slower speed - about 400rpm. - still nothing - I'd been brought up with "let the drill do the work" but some of the videos show pressure being applied. so I lent into the drill a bit - and then - oh boy ladies and gentlemen we have swarf !so, after a frustrating couple of hours I had finally figured out how to use these and after that I drilled thru the bolt in a couple of minutes. the others followed - using the same drill bit - not fast but these are stainless steel bolts I'm drilling thru.so - a first class product - just take a moment to figure out how to use them !

Very good. I needed these to accurately drill a whole in a hardened hinge knuckle and pin to take a security spring pin. The drill tip followed the centre punched mark without any "wander" and cut the hinge and pin metal easily and perfectly.I understand that these can be re-ground when blunt but, due to the quality and hardness of the tip, I doubt that it will be needed very often.No more false economy "bargains" for me, I am very impressed with the quality of this product and shall be ordering more sizes as necessary.

Bought these to drill out broken hardened screws that had completely defeated normal HSS drill bits. With a slow drill speed, progress was immediate and multiple screws were drilled out with no perceptible deterioration in the performance of the bit. If you need to drill hard metals these bits are a revelation. I've since purchased smaller diameter bits for drilling lock wire holes in hardened bolts, which they have done with ease. Good price for what these do.

Used to drill domex with a bit of patience worked a treat.

These bits save my car. I tried many tips, when I had to drill out a hardened screw out of the subframe on my car. You get 10 bits, I broke 3 , but the 4th one did the job. Any other HSS tips like bosh did not even drilled in to the hardened screw. Well done