The DEWALT DT2444 Reciprocating Saw Blade Set contains the most popular long-life blades for a variety of applications, including cuts in ferrous and non-ferrous metal, sheet metal, pipes, wood, wood with nails, aluminium, fibreglass and tough plastics. The blades have a bi-metal construction combining HCS and HSS for increased flexibility and durability. Contents 2 x Bi-Metal General Purpose Reciprocating Blades 152mm x 2.5 TPI 2 x Bi-Metal Reciprocating Blades for Wood with Nails 228mm x 3.6-5.1 TPI 2 x Bi-Metal Reciprocating Blades for Metal 203mm x 1.8 TPI