DEWALT Bi-Metal Reciprocating Blades for extreme applications, as well as demolition work. They have a bi-metal construction, combining a HCS body and cobalt-alloyed HSS cutting teeth for increased flexibility and durability. Aggressive tooth geometry with a special angle for a fast and effective removal of material, especially for tensile and abrasive metals. Universal shank fits all major brands including DeWalt, Bosch, Hitachi, Flex, Makita, Metabo, Skil.