Super SAWZALL Blade are made with Matrix II high speed steel teeth containing 8% Cobalt to Keepa sharper tooth edge longer. The tough Bi-Metal design allows faster cutting, longer life Blade that can bend without shattering. Milwaukee designs and manufactures Sewall Blade for the toughest professional applications. This blade has a 1/2 in. universal tang that fits all SAWZALL and standard competitive saws. Includes 5 individual Blade. All purpose blade for cutting all woods, nail embedded woods, composition material, plastic, ferrous and non-ferrous metals, and cast iron.