Super SAWZALL blades are made with Matrix II high speed steel teeth containing 8% Cobalt to keep a sharper tooth edge longer. The tough Bi-Metal design allows faster cutting, longer life blades that can bend without shattering. Durable, long life blades are the goal of every blade we make. This blade has a 1/2 in. universal tang that fits all SAWZALL and standard competitive saws. Includes 25 individual blades. For very fast cutting in nail embedded wood and general roughing-in work.