Through-the-handle exhaust design, which incorporates its revolutionary worldwide patented internal muffler/filter. Patented ergonomically engineered handle design to relieve stress and fatigue on the operator's hands, wrists and arms. Twin clutch mechanism. Maximum torque: 500 ft./lbs.. Free speed: 10000 RPM The superior mechanics and internal mechanism of the NitroCat includes high quality bearing surfaces, air chambers and operation turbines, with a system that allows exhaust to exit through the handle. Previously, all pneumatic tool designs discharged air through front vents. In recent years, companies have begun to recognize the need to exhaust air through the handle instead of through the front of the wrench. The benefits of the through-the-handle exhaust design include reduced hazards from breathing exhausted air particulates, the elimination of blow-by into the operator's eyes and lungs as well as reduced noise. Mechanics handling high speed impact wrenches find it increasingly difficult to hold on to traditionally shaped tools for long periods of time. The patented AirCat handle offers better overall distribution of weight for a balanced tool and provides a unique grip that makes it easier to use for prolonged periods of time.