The LENOX General Purpose Reciprocating Saw Blade Set cuts through a wide variety of materials.Designed for making quick, clean cuts in metal, wood, and plastic.A high-speed steel cutting edge and spring steel backing helps strengthen the blade, reducing breaks and increasing durability for long blade life.Supplied in a handy storage case, contains the following:5 x 656R Bladesfor cutting wood with nails.5 x 614R Bladesfor cutting pipes, construction and stainless steel (2.56mm) , non-ferrous metal (2.510mm) .5 x 618RBladesfor cutting structural steel, pipes, stainless steel (1.55mm) , non-ferrous metal (1.58mm) .