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.