21Pcs Titanium Drill Bit Set, M35 Co 5% High Speed Steel HSS for Steel Alloy and Other Hard Metals have a 4.6 outo 5.0 rating.
There are several quality stages of HSS material,4241,4341,9341,M2,M35, among them M35 Co 5% cobalt is best level.There are several quality level of drill bit process,roll forged,edge gound,and fully ground.Among these process,fully ground is best level. So this is A+A top set.
Excellent for cutting through hard metal, like stainless steel, aluminum alloy, and titanium alloy.M35 ensure good cutting power,fully ground ensure easy and fast cutting, 135° split point ensure good positioning,and gold-oxide coating resists heat build-up and enlong bit life.
Size:2x1/16-in, 2x5/64-in, 3/32-in, 2x7/64-in ,2x1/8-in 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", and 1/2"