Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)

Great tool! By far best drill bits I've used - I've had snap on to dewalt to Irwin and these are head and shoulders above.Not only that, some have blunted and broken as all drill bits do, the tray comes with a little leaflet inside telling you if any bit breaks, message them through Amazon and they'll replace the drill bit FOC.Ive broken 2 drill bits on separate occasions months apart, messaged them on each occasion and twice they have said no replacement in stock, but delivered a brand new full set of bits for free straight to my door on 2 separate occasions.Absolutely amazing service, value and quality.

Had a box for over a year now. One use was on quite a few bits of steel from old power pylons, fairly sturdy stuff, hand held drill due to location. Another use has been on galvanized steel field gates, again hand held drill.Holes are made very quickly compared to other bits I've used, but I am an occasional driller rather than professional.They may be more brittle than standard HSS bits as we had a 6mm snap and a few larger bits chip at the ends. I think more careful use could have avoided this but that's hard to do with a hand held drill in some situations.I contacted the seller about the broken bits and within a few days I had a full replacement set!I am seriously impressed with their customer service and warranty.

Work well on steel and stainless, not broken one yet which is good for me! Funky tips work well without a pilot

My dad & I were building a soapbox from salvaged metal, which included an old projector post. This metal tube burned out every single drill bit we owned, even if we started with a small pilot hole and worked up in steps.We tried my last bit, a 10mm high cobalt bit (not from this set), which made it through, but it was also a casualty of this insanely hard tube.I purchased these bits, we mentally prepared ourselves to attack this tube the following weekend and...... the thing was like butter, as if it had never presented itself as a problem!We started at our target (8mm) expecting them not to last, and experienced a very minor amount of chipping due to the stepped design, but it doesn't appear to have affected the performance since.When using them properly (ie, with a pilot hole, lubricate the bit, slow and steady) they are utterly flawless.If you can afford them, buy them, you won't need another set of twist bits unless you eat them.

Drill bits sizes 3mm and 3.5mm have snapped after drilling 30 or so holes in steel. Sizes 2.5mm, 4mm and 4.5mm have gone blunt with very little use.The warranty card promises free replacement of broken bits. I think it fails to mention that this only applies within 30 days of purchase.

Good quality drills i got them to drill industrial quality nuclear stainless Steel so really tough got to use cobolt no other drills will do .

Best selection of cobalt drill bits I found online and a good price.I can now throw out all the blunt HSS drill bits.

they break if used with a hand drill but good on a drill press