DEWALT Bi-Metal Reciprocating Blades for universal use They have a bi-metal construction combining HCS and HSS for increased flexibility and durability With cobalt-alloyed M2 HSS cutting edges for increased wear resistance The reinforced tooth shoulder provides improved stability Suitable for general purpose use in wood metal tough plastic and sandwich materials These blades are particularly ideal for use in tough plastics and pipes 3-12mm thick Universal shank fits all major brands including DeWalt Bosch Hitachi Flex Makita Metabo Skil