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ACDelco ANI403 1/2" AIR Impact Wrench provides: Maximum 650 ft-lbs of torque with Twin Hammer mechanism. Strong and durable aluminum alloy housing. Powerful and durable impact mechanism. Forward: 6 speeds; Reverse: 6 speeds. Front exhaust design. Free speed of 8,000 RPM. Standard Bolt size: 5/8-inch. Air consumption: 5.3 CFM. Overall length: 7-1/8-inch. Air pressure: 90 PSI. Tool weight at 5.58 lbs. [ACDelco Tools] ACDelco power tools are built for people who make a living with their tools, day in and day out, regardless of industry you are in and require reliability.