Lasting up to 50% longer, the DEWALT 18 TPI Straight Back Bi-Metal Reciprocating Blade features a patented tooth form that delivers fast, smooth cuts for a range of metal cutting applications. The bi-metal reciprocating saw blade's bi-metal construction is designed to extend blade life and minimize blade breaks. A specially formulated anti-stick coating on the bi-metal reciprocating saw blade minimizes friction and gum-up. The bi-metal reciprocating saw blade's aggressive shank angle increases tooth contact, maintaining cutting speed as blade wears for longer blade life. This bi-metal reciprocating saw blade is made durable to last a long time.