Product details:

The 231 Series has set the standard for impact performance for over three decades. Refined engineering design has perfected the performance that has made the IR231 series the most popular impact ever, rivaled only by IR's composite impacts. IR's elite mechanism is the perfect balance between superior power and proven durability. Handle exhaust directs air away from user Contoured comfort handle Pressure-feed lubrication feature Adjustable power regulation Specifications: 1/2 square drive, 7.3 length, 4.2 CFM average air consumption, 1/4 NPT (F) air inlet, 3/8 minimum hose size, 91.2 dBA sound pressure, 590 ft.-lbs. maximum torque, 8,000 rpm free speed.