Starrett Bi-metal hole saws are constructed of hardened, heat & abrasion resisting high speed steel teeth with a tough alloy body & cap. This gives them exceptional strength, durability & shatter resistance for user safety. They will cut any wood, metal or plastic in either a h&-held drill or a drill press. Max. Cutting Depth. 38 mm. Size. 30 mm. 1 3/16 inch.