M35 Cobalt Countersink Drill Bit Set for Metal,1/4'' 3/8'' 1/2'' 5/8'' 3/4'' Set with Bit Holder, Hex Shank HSS Countersunk Bits 82 Degree 5 Flute,Fit All Most Machinable Metals,Hardwood,Plastic

Used to make holes for 24 by 36 inch acrylic sign for a small business . Loved the quality . It’s very sharp and exactly what I was looking for . Good value for money , came packed very nice

These bits worked great for countersinking some larger screws on an exterior project I had, what I liked specifically about this set is it comes with the large 3/4” bit.

Had two 4mm pieces of stainless steel i needed countersunk, the bits did it although certainly not with ease. Took me hours and the bit is pretty much junk now… but it did it

I bought it for my brother and it works well for him. It came oiled in a little bag so it cannot corrode.My brother uses it for his carpenter project (making furniture at home).

Some countersinks, I have purchase in the past, look like they were made before the Mayflower. Just plain rough cut all the way around. Was happily surprise after opening the package. Someone took their time in the machine process. I haven't had them long enough to rate Longevity or Durability, but M35 cobalt should last for a long time , if treated right, meaning, running it @ proper speeds and so on. The cutting edges are well define in shape and sharpness. Would highly recommend to anyone.

I cut 10 recesses in a 3/16 steel panel and it stayed sharp

I like that I can use this right out of the package with out having to change drills or use an adapter. They are sure sharp and very durable

I am not happy with it.