This powerful, lightweight Ingersoll Rand composite air impact wrench delivers high torque through a sophisticated power management system. It can handle the toughest jobs. Drive (in.): 1/2, Speed - No Load (RPM): 9,500, Blows Per Minute (BMP): 1,200, Max. Torque (ft.-lbs.): 550, Hammer Mechanism: Twin, Noise Level (dB): 96.6