This classic is the most popular tool in its class. Introduced over 25 yeas ago and continuously refined, it offers the sheer power and performance features to tackle the toughest jobs with ease - as well as proven durability and economy. Exclusive impact mechanism Pressure-feed lubrication Adjustable power regulator Easy to service two-piece construction Contoured handle for comfort and control Maximum Torque: 425 ft.-lb. Avg. Free Speed: 8,000 rpm Weight: 5.8 lbs. (2.63 kg) Length: 7.3 (185 mm) Avg. Air Consumption: 4.2 cfm Minimum @ load: 22 cfm Sound (pressure/power): 102/115 dBA Inlet NPTF: 1/4 Hose Size: 3/8 (10 mm)