$62.99 Tradespro 837212 24-volt 1/2-Inch Drive Cordless Impact Wrench Kit | eBay
Hitachi 12 Volt 1/2 Drive Cordless Impact Wrench in the Impact Wrenches department at Lowes.com
Milwaukee M18 Cordless Impact Wrench with Friction Ring â 1/2in. Drive, 450 Ft.-Lbs. Torque 
