Hole saws. EXTRA EASY-CUT carbide hole saws. Karnasch EXTRA EASY-CUT carbide-tipped hole saws for steel < 1400 N, stainless steel < 900 N, gray cast iron, aluminum > 10% Si, copper, brass, tin, plastics, GRP/CRP and sandwich material. Available completely with shank, center drill and ejector spring, with lengths of 8 mm, from Ø 14 mm to Ø 38 mm.