These BENCHMARK M42 bi-metal reciprocating saw blades are designed to stay sharp and flexible, while resisting shattering under hard conditions. Perfect for fast cuts in nail-embedded wood, these reciprocating saw blades resist bending or warping on even the toughest jobs. These heat-treated blades are designed with a progressive tooth design of 6/12 variable teeth per inch for faster cuts and less vibration, in a variety of wood cutting applications.