EWORK Cordless Impact Wrench 1/2 inch 21V Brushless High Torque Impact Gun Max 700 Ft-lbs Power with 4.0Ah Li-ion Battery, Fast Charger, 5 Sockets, Tool Bag (RB-810) - Amazon.com
Milwaukee M18 FUEL Gen-2 18V Lithium-Ion Brushless Cordless Mid Torque 1/2 in. Impact Wrench w/Friction Ring (Tool-Only) 2962-20 - The Home Depot
20V Cordless 3/8 in. Compact Impact Wrench - Tool Only
Bosch 18-volt Variable Speed 1/2-in Drive Cordless Impact Wrench in the Impact Wrenches department at Lowes.com