This model redefines the standards set by the classic IR231 model, with an enhanced Twin Hammer impact mechanism for more power, and in-handle exhaust to direct air away from the operator and the work area. 450 ft.-lbs. maximum torque. Pressure feed system provides continuous lubrication. Variable power control in forward and reverse. Increased durability, quieter operation, and more comfortable handle contour. 2" extended anvil for use with flip sockets, making it a superior tool for tire changing.