The M18 Cordless Lithium-ion 1/2" High-Torque Impact Wrench features a Milwaukee 4-pole motor and powerful impact mechanism to deliver a reliable 450 ft-lbs of torque with maximum runtime. The REDLITHIUM Extended Capacity Battery Pack (sold separately) delivers more work per charge and more work over pack life than the competitors, as well as best-in-class performance in extreme jobsite conditions. You'll get consistent speed control between 0-1900 RPM and 0-2200 IPM with the variable-speed trigger.