Matrix II high speed steel teeth containing 8 percent Cobalt to keep a sharper tooth edge longer. Bi-Metal design allows faster cutting, longer life blades that can bend without shattering. 1/2 in. Universal Tang fits all Sawzalls. Applications: Cutting Metal 3/16 in. thru 1/4 in., Conduit, Tubing, Channels, Pipe, Rubber, & Fiber.