TUSK TOOLS have carefully selected 5 of their "must have" BI-METAL (BiM) reciprocating saw blade designs to cover you across a full range of material applications. Ideal set to keep on hand for any DIY or renovation situations. TUSKs multi-material blade designs will cut both wood and metal - and as such, are the perfect tool for the job becasue they can deal with a variety of materials without the need to change out blades. BiM construction adds flexibility, breakage & heat resistance, hardness and durability. Teeth made from M42 grade steel for maximum performance, longer life, versatility, and toughness even with METAL applications such as thin sheet metal, middle metal plates, profiles and pipes.