General description The IRWIN Bi-Metal Reciprocating Blade Set includes a versatile selection of blades designed for the most popular cutting applications. This set is ideal for both wood and metal cutting tasks, making it a valuable addition to any toolkit. Technical specifications 5 x Nail Embedded Wood Bi-Metal Blades: 152mm length, 6 TPI 4 x Thick Metal Bi-Metal Blades: 152mm length, 14 TPI 1 x Medium Metal Bi-Metal Blade: 203mm length, 18 TPI 1 x Nail Embedded Wood Bi-Metal Blade: 228mm length, 6 TPI