Get the impact wrench that has the greatest power, is the smallest, and runs the longest. The Milwaukee® 4-pole motor and strong impact mechanism in the M18TM Cordless Lithium-ion 1/2" High-Torque Impact Wrench work together to reliably provide 450 ft-lbs of torque while maintaining maximum runtime. In comparison to its rivals, the REDLITHIUMTM Extended Capacity Battery Pack (available separately) offers superior performance in challenging jobsite circumstances, more work per charge, and more work throughout the course of the battery pack. The variable-speed trigger provides constant speed control between 0-1900 RPM and 0-2200 IPM. Changes in sockets can be made quickly and simply with a one-handed anvil that is 1/2" in diameter.