popular ! Ingersill-Rand 231A 1/2" impact gun

The Ingersoll Rand 231A air impact wrench has a 1/2-inch drive size, a working torque range of 425 ft-lbs, a at no charge speed of 8,500 rpm, and a weight of 5.8 lbs. It uses a trigger actuation with a pistol configuration. The maximum pressure is 90 psig/6.2 bar. The air inlet thread size is 1/4-inch NPTF, and the minimum hose size is 3/8-inch. 

Here's a more detailed look at the specifications: 

Drive Size: 1/2-inch

Maximum Torque: 600 ft-lbs

Working Torque Range: 25-350 ft-lbs

complimentary Speed: 8,000 rpm

Weight: 5.8 lbs

Air Consumption: 4.2 cfm (average), 22 cfm (at load)

Sound Pressure/Power: 99/110 dBA

Air Inlet: 1/4-inch NPTF

Minimum Hose Size: 3/8-inch

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I would highly suggest purchasing air tool oil to keep it running tip top. Recently tested on lug nuts and works flawless.