SP Air Corporation SP-7730 model is a 3/8-inch reaction free high-speed impact ratchet wrench. The unit is a reaction free ratchet wrench, so the vibration shock pain from normal air ratchets is not present. Unit specifications include a drive size of 3/8-inch and bolt capacity of 3/8-inch, a working torque range of 100 ft-lbs., a free speed of 450 RPM, a vibration level of 5.8 m/s, and a sound level of 88.2 dB