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 3.5-10mm, wood with nails, particleboard 3.5-90mm, non-ferrous metal, aluminium, plastics 2-30mm.Length: 132mm.Pitch: Progressive Precise Cut.Supplied in a pack of 5.