Litheli Impact Wrench Cordless, 1/2 inch Power Impact Driver with 320 ft-lbs(430N.m) Max Torque, 20V Impact Gun Kit with 2.0Ah Li-ion Battery & Fast Charger for Car Home - Amazon.com
Klein Tools Battery-Operated Impact Wrench Kit - 7/16in
SILVEL 21V Cordless Impact Wrench 1/2 inch, 517 Ft-lbs (700N.m) Max Torque, Brushless Impact Driver with 1.5Ah Li-ion Battery, Charger, 6 Sockets, Power Impact Gun for Car - Amazon.com