DEWALT Bi-Metal Reciprocating Blade for Universal Use 305mm (Pack 5)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. Universal shank fits all major brands including DEWALT, Bosch, Hitachi, Flex,