Mfr # 22711R. Hammer, chisel, carve, smooth, and reshape wood, metal, and even stone with the STEELMAN 22711R . This compact, 4.5-inch long tool weights only 4-pounds but conceals inside a powerful pneumatic motor capable of delivering 2,100 blows per minute (BPM). The 3/4-inch bore features a 3-1/2-inch stroke length for maximum impact power during use resulting in greater efficiency with less effort. The quick change retainer is tooled to accept standard sized 0.401-inch chisels to be compatible with a wide range of tip styles and types to enable working on a variety of materials for both material removal and finishing. The handle's air inlet is threaded to accept 1/4-inch NPT quick connect fittings and adapters for easy connection to existing shop pneumatic air delivery systems. Energy efficient, this air hammer operates on 4 CFM of compressed air at 90 PSI. So whether you need to deburr steel, split ball joints and rubber bushings, break apart concrete or stone, and similar jobs, STEELMAN tools will help you work smarter and faster.