FEATURES Adjustable 3 speeds for Forward/Reverse mode. Most power and compact, deliver best power-to-size ratio in this class. Use for heavy automotive and truck repair, construction or assembly line. New twin hammer designed for more torque and less vibration.  SPECIFICATIONS Brand Name Zipp Air Tool USA Item model number ZIW4206TK Std. Bolt Size 5/8" (16 mm) Square Drive 1/2"(12.7 mm) Free Speed 11,000 RPM Max. Torque (15 Sec) 450 ft-lb (610 NM) Operating Air Pressure 90 PSI (6.2 bar) Avg. Air Consumption 7 cfm (200 l/min) Net Weight 3lbs (1.37 kgs) IMin.Hose Size 3/8"(10mm) Air Inlet Size 1/4" NPT/PT