Sandflex 3830-C Bi-Metal Hole Saw is specially designed for metal cutting but can be used in most materials such as wood and plastics. The hole saw cuts through ferrous metals like steel, stainless steel, cast iron and non-ferrous metals like aluminium, brass, copper with cutting depth max 38mm (1 1/2″). Bi-metal construction with 8% cobalt for increased wear resistance. All -C hole saws are packed in a retail package with tooth protector. All -VIP hole saws are packed in a cardboard box with an instruction leaflet enclosed.