Ryobi P263K 18V Cordless 3/8 in. Impact Wrench Kit with 1.5 Ah Battery and Charger - - Amazon.com
WORKPRO 20V Cordless Impact Wrench, 1/2-inch, 320 Ft Pounds Max Torque, 2.0Ah Li-ion Battery with Fast Charger, Belt Clip for Easy Carrying - - Amazon.com