FireBird FB-1306T 1/2" Drive Air Impact Wrench This is a brand new high-quality, compressed air impact driver made by FireBird, part number: FB-1306T. This is a 3/8" drive impact wrench that outperforms many of the higher-priced brands. This impact gun features a twin hammer mechanism, and the free speed is 11,500 RPM. The max torque rating is 230 ft-lb/312N.M. 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.