The Snap-on 18V, 1/2" impact wrench, No. CT4850HO, features a super heavy-duty motor with heat-treated alloy gears, increasing the torque output to 400 ft./lbs., with 2,100 blows per minute. The wrench's patent-pending true flat anvil allows the socket to easily slide on and off the anvil, and its reduced-length nose design provides better access to fasteners to improve efficiency and productivity. A comfortable, oversized contoured trigger and one-handed forward/reverse switch allows for precise control and speed handling in hard-to-reach spaces. Snap-on's patented dual rail slide-on battery pack allows for longer battery terminal life and the VersaVolt Battery System can be used with all Snap-on cordless accessories.