19-Piece M35 Cobalt Steel Metric Drill Bit Set, 1-10mm

These bits have become my go-to over Dewalt and Milwaukee. These outperform the milwaukee hard metal bits. Every once-in-a-while you find something that delivers beyond its price. This is definitely one.

The drill bits are well made and perform really good. They came in a convenient and well designed metal storage box. I like the product.

These are a pretty good deal for the $. Quality looks to be there. Longevity is yet to be determined.

Here in the USA, Metric drill bits are extremely scarce as most of the country insists upon using an outdated Imperial system of drill bit sizes varying from fractions of an inch (21/64" anybody?) to an inverse numbering system (with a #2 being bigger than a #6) Refreshingly, the entirely decimal Metric system comes to the rescue! This Metric drill bit set is sized from 1.0mm to 10.0mm in 0.5mm increments. a most useful selection. The bits themselves are sharp and drill clean holes but the metal case, or drill index is not especially great. For sharpness, in a recent project I drilled 16 x 5mm holes and 10 x 3mm holes through 6mm thick aluminum. The last holes drilled as quickly and cleanly as the first, so they are at least decently sharp and durable. By the way, for those that absolutely can not get their head around millimeters, the smallest 1.0mm drill bit is this set is close to 3/64" and the largest 10mm drill is close to 25/64", or a bit bigger than 3/8"

Convenient case. Drill bits appear to be good quality. So far, have only used the 10 mm drill bit to enlarge a 3/8" hole to 10 mm. It worked fine.

The drills are fully ground as described. They appear to be HSS Co (per DIN 338), though they have the same profile as a regular 118 degree split point HSS jobber drill. The web is not as thick as other Co drills I have which have 135 degree split points. Since some reviews said these drills dulled easily, I tried one in C1018 steel - no problem. I didn't try stainless steel since machinability can vary drastically with alloy and heat treat. Since I get most of my steel from a recycler, I've learned to be careful since I don't usually know the alloy.

I bought the 19pcs(Metal Case) from which the drills are quite good. But it got delivered in a envelope and the tin can got damaged that I can not use it. It does not close anymore as well. Would have rated it higher if tin can was not damaged.

Metric Drill Bits. Cobalt, so they should work for Drilling Metal. They are 5% Cobalt (M35), so they are not too brittle to use in a hand drill, if needed.

Comme décrit

Cuts through stainless ok and I haven't snapped one yet.

These drills are definitely NOT cobalt and are falsely described

This is a nice set of cobalt bits in a metal case, with labelled slots for each bit, each of which is engraved with it's metric size and the "Hss Co" designation. Lots of drill bit for the money, as they go in .5mm increments from 10mm, all the way down to some absurdly tiny ones that I'll never use; but the value is in the number of hefty bits at the upper end of the scale. All bits arrived quite sharp, with no apparent flaws in their construction. As far as their performance, I used them to drill out a wheel stud on my truck, to remove a broken off wheel nut. The smaller bits that I started with worked flawlessly, but one of the larger bits did have part of it's cutting edge chip off, as if it were some kind of coating, but I was using too much positive pressure. The other large ones I used worked great (with my adjusted pressure) and are still sharp enough to be used for future projects. Overall well worth their cost.

Haven’t been using them on a regular basis, but so far the metals I’ve been drilling through haven’t killed the bits.