Irwin Jigsaw Metal & Wood Cutting blades made from Bi-Metal which is a highly flexible tough combination of HSS and HCS is suitable for the most demanding applications With a universal shank and HSS and BiMetal progressive tooth form for all-purpose cutting in wood and metal Progressive tooth spacing for fast cuts long life in metal 35-10mm wood with nails particleboard 35-90mm non-ferrous metal aluminium plastics 2-30mm Length 132mm Pitch Progressive Precise Cut Supplied in a pack of 5