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