... ,rounder holes 2.Up to different holes sizes 3.Size:6/9/13 Step Drill Bit 4.Material:HSS M42/M35/M2 ... (1/4", 5/16", 3/8", 7/16",1/2", 9/16",5/8",11/16",3/4")C. 1/8 ... (1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7 ... /16", 15/32", 1/2") HSS(m42/m35/m2) 6/9/13 Step Drill Bit Different Size