Adedad 20V Brushless 1/2 inch Cordless Impact Wrench with Battery, Fast Charger, LED Light - 240 ft-lbs Torque 3000 RPM - Amazon.com
DEWALT Variable Speed 1/2-in Drive Cordless Impact Wrench (Bare Tool) in the Impact Wrenches department at Lowes.com
Milwaukee 2659-20 M18 1/2" Impact Wrench with Pin Detent, Bare Tool
Amazon.com: Ingersoll Rand 2130 1/2" Drive Air Impact Wrench, 550 ft-lbs Max Torque Output, 7000 RPM, Heavy Duty, Lightweight, Use for Changing Tires, Auto Repair, Black : Everything Else