Sioux Tools IW500MP-7Q Impact Wrench | 7/16" Drive | 9400 RPM | 600 ft.-lb. Max Torque | Pro Tool Warehouse
Cordless Impact Wrench 1/2 inch for Dewalt 20V Battery, 600 Ft-lbs (810N. m) Brushless High Torque Power Tool with LED Work Light and Belt Clip (Battery Not Included) - Amazon.com