Milwaukee's super SAWZALL blades are made with Matrix II high speed steel teeth, containing 8 percent cobalt to keep a sharper tooth edge longer. The tough bi-metal design yields much faster cutting times, longer life, and blades that bend without shattering. Milwaukee designs and manufactures SAWZALL blades for the toughest professional applications. Materials, tooth configuration and heat treating are designed to maximize performance in specific cutting applications. These blades have a 1/2 In. universal tang that fits all SAWZALL and standard competitive saws. Includes 50 individual blades.