HSS TiN coated step drill 1/4-1-3/8", straight double fluted, 10 steps(1/4",3/8",1/2",5/8",3/4",7/8",1",1-18",1-1/4" and 1-3/8"), shank:1/2", nw:167g
Suitable for drilling thin metals steel, aluminum, copper, brass, fiberglass, PVC…
No pilot holes or pre-drilling required