The Bosch 25618-01 18V 1/4 In. Hex Impact Driver combines outstanding fastening ability with a compact design for the toughest jobs. It has a robust motor and all-metal gears to produce 2,800 no-load RPM and up to 1,500 In.-Lbs. of screwdriving torque, enough to drive up to 150 3 In. lag bolts between charges. This tool uses the hammer and anvil system to deliver 3,200 BPM as well. It has a compact impactor design, with a head length only 5.7 In. and a weight of only 3.8 Lbs. This impact driver provides a Quick Change Chuck, Electronic Cell Protection and the best runtime in class, thanks to the 18V FatPack batteries.