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
DW4810 4″ x 18 tpi straight back bi-metal reciprocating saw blades for cutting mild steel under 1/8″, galvanized pipe, aluminum pipe and channel. Sold in packs of 5.