These Milwaukee Replacement Reciprocating Sawzall Blades feature Matrix II high-speed steel with 8 cobalt for cutting metal 1/8in. thru 3/16in., conduit, tubing, channels and pipe. Blade Application Metal cutting, Blade Material Bi-metal, Blades qty. 5, Reversible Yes, Tang Size in. 1/2, Tang Style Universal, Blade Size in. 12, Blade Type Straight back, TPI Teeth per Inch 18. Matrix II high-speed steel teeth with 8 cobalt For cutting metal 1/8in. thru 3/16in., conduit, tubing, channels and pipe Tough bi-metal design for fast-cutting, long-lasting blade life 1/2in. universal blade tang fits all Sawzalls Blade reversible in clamp Model 48-00-5189 U.S.A.