"These Milwaukee Replacement Reciprocating Sawzall Blades feature Matrix II high-speed steel teeth with 8 cobault and are excellent for cutting all woods, nail-embedded woods, composition material, plastic, and ferrous and non-ferrous metals. Blades qty. 5, Blade Type Straight back, TPI Teeth per Inch 10, Tang Size in. 1/2, Blade Application General applications, Blade Size in. 6, Blade Material Bi-metal, Tang Style Universal, Reversible Yes. Matrix II high-speed steel teeth with 8 cobalt For cutting all woods, nail embedded woods, composition material, plastic, ferrous and non-ferrous metals Tough bi-metal design for fast-cutting, long-lasting blade life 1/2in. universal blade tang fits all Sawzalls Blade reversible in clamp Model 48-00-5092 U.S.A."