Starrett Bi-metal holesaws 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 38 mm. 1 1/2 to suit (available separately) Code Holesaw Size 14-30 mm. 11/32 in. (8.75 mm.) Hex STRA4 14-30 mm. 1/4 in. (6.50 mm.) 32-152 mm. 7/16 in. (11.00 mm.) Hex STRA10 32-152 mm. 11/32 in. (8.75 mm.) Hex.