ColumPRO 4PCS Cobalt Single-End Countersink Chamfer Tool Set - Heavy-Duty M35 90-Degree Countersink Bits for Metal, Stainless Steel, Copper, Wood, Fiberboard,SAE 1/4"-3/4", 2-5, 5-10, 10-15, 15-20MM

Fast delivery good price and quality

These countersinks/chamfer bits work great on steel and have been holding up very well, very durable, and quick to do the job. Highly recommend.

So far I have used these on Aluminum, acrylic, delrin, PLA, nylon, pvc, and brass. Works great on all of them. Can't believe I waited so long to buy a set of these.

I used the smaller of the three (not sure when i will ever use the larger two, wish i could have purchased a smaller set of three for household uses) and drilled a pilot/through hole for the h/w i was going to use. Using a hand drill with adjustable collet, the chamfer tool worked perfectly. i needed to increase the screw diameter size, hence the chamfer diameter needed to increase slightly and i was able to resize w/o any difficulty. All told, the tool cuts nicely w/o chatter or wander and gave me the countersink i needed.

What a great set of bits. Was able to use on stainless steel without any issue whatsoever. Such A nice surprise to buy something that actually is quality.