This is a brand new high quality, compressed air impact driver made by Fire Bird, part number: FB-1451. This is a 1/2" drive impact wrench that out performs many of the higher priced brands. This impact gun features a twin hammer mechanism, and the free speed is 8,000 RPM. The max torque rating is 635 ft-lb. The working PSI is 90 PSI, this gun features a 1" anvil length. Whether you are using this impact driver in your own home, shop, or garage or in an industrial  setting, this is a high performance pneumatic torque driver that will get the job done.  

Specifications:

Brand: Fire Bird
Part Number: FB-1451
Mechanism: Twin Hammer
Free Speed: 8,000 RPM
Max Torque: 635 ft-lb / 861 N.M
Net Weight: 2 Kgs 
Anvil Length: 1"
Air Pressure: 90 PSI
Air Inlet: 1/4" Female NPT 
Exhaust System: Handle 
1/2" Square Drive