the Milwaukee M18 Fuel Sawzall Recip Saw 1 Battery Kit is the next generation of legendary performance and durability, designed for the toughest applications on the job site. The M18 Fuel SAWZALL is the fastest cutting reciprocating saw in its class and leverages a Powerstate Brushless Motor to provide users with 3,000 SPM and a 1-1/4 in. stroke length for faster material removal.