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 1/8 In. Thru 3/16 In., Conduit, Tubing, Channels, & Pipe.