Composite Body Air Impact Wrench,Max. Torque of 650 ft-lbs. Torque of 650 ft-lbs., New. Specifications Square Drive: 1/2" No Load Speed: 8,000 RPM Max. Torque: 650 ft-lbs. Composite Body Air Impact Wrench, (1) 1/4" NPT Male Plug, and (1) Operator's Manual.