1/4" Shank 8 steps HSS Titanium Nitride Step Drill Bit Metal Wood Cut FEATURES: 1/4" Hex Shank , Triangular shank design will not spin inside the chuck HSS with heat treated Desinged to auto deburr the hole cut. Titanium Nitride Coating last up to 4-5 times than ordinary drill bits Drill round holes in most metals, plastic, wood...etc Self-starting tip will not skid No center punching Or pilot hole required Compatible with all electric drills and drill presses Sizes: 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", & 1"