Product Description Lasting up to 50% longer*, these Metal-Cutting Reciprocating Saw Blades feature a patented toothform that delivers fast, smooth cuts for a range of metal cutting applications. Their Bi-Metal construction is designed to extend blade life and minimize blade breaks. From the Manufacturer For cutting metal trim, conduit and tubing (18 gauge and under). Reciprocating saw blades are used for cutting a wide variety of materials ranging from wood and metal to plastic and drywall. In general, lower tooth counts cut faster, but provide a rougher finish. Blades will fit all brands of reciprocating saws. 2 pack.