The 6509-31 Sawzall Recip Saw delivers best in class cut speed, durability and power with 0-3,000 strokes per minute, a 3/4? stroke length and a 12 Amp motor. The gear protecting clutch extends gear and motor life by absorbing high impact forces and a QUIK-LOK blade clamp offers fast tool-free blade changes. To provide greater user comfort, a counter weighted mechanism reduces vibration for smoother operation and a redesigned front grip area provides best in class ergonomics.