HSS TiN coated step drill 1/4-3/4", straight double fluted, 9 steps(1/4",5/16",3/8",7/16",1/2",9/16",5/8",11/16"and 3/4"), shank:3/8", nw:57g
Suitable for drilling thin metals steel, aluminum, copper, brass, fiberglass, PVC…
No pilot holes or pre-drilling required