IRWIN Unibit 3 8 in 13 Step Drill Bit Flooring new 15 Specification Details Collection Name Alamosa it is listed for Specification Details Collection Name Alamosa Type Flush mount light Fixture Color Family Bronze Fixture Finish Antique Manufacturer Color Finish Olde Bronze Shade Color Finish Family Clear Height (Inches) 7 After application Single fluted cutting edge for greater control and rounder holes Ideal for drilling holes in thin materials such as mild steel wood and laminates 3 flatted shank won't slip in chuck Speed point tip for fast starting Laser marked sizes won't wear off with use Unibit #3 is engineered with M35 cobalt steel for maximum life when drilling in tough steel Unibit #3 cobalt contains a 3 8 in hex shank and contains 9 hole sizes 1 4 in 3 4 in (1 16 in steps) Unibit #1 contains a 1 4 in hex shank and will drill 13 hole sizes 1 8 in 1 2 in (1 32 in steps) Unibit #4 contains a 3 8 in hex shank and will drill 12 hole sizes 3 16 7 8 in (1 16 in steps)