SP Air's 1/4" and 3/8" Baby Butterfly Impact Wrench, Nos. SP-1850S and SP-1850, features a butterfly throttle which allows the user to operate the tool at the speed s/he wants in either forward or reverse, with one hand. It can work in confined areas, and is used for transmission work and small engine repair. The air inlet swivels 160 degrees providing greater ease of operation. The unit specifications include a maximum torque of 72 ft/lbs., a free speed of 10,000 rpm, a sound level of 87.4 dB, a vibration level of 6.2 m/s and has an air consumption of 9.3 CFM (4.4 L/sec).