The ideal impact wrench for transmission, exhaust system, body or small engine repair, the butterfly impact wrench fits into tight spots other wrenches won't. The namesake butterfly throttle gives you smooth, single-handed control for forward and reverse. Built-in regulator for greater speed control, maximum free-speed of 10,000 RPM on only 4 CFM air consumption; 75 ft-lbs maximum torque, 1/4-inch NPT inlet, 3/8-inch hose, 90-120 PSI.