Advanced Titanium Steel Step Down Variable Size Sized Steel Drilling Drill Bit Uni Detailed

1/2" Hex Shank HSS with heat treated 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 12 Hole sizes in 1/16" increments Sizes: 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1 1/16", 1 1/8"