According to Ingersoll Rand, the ThunderGun, No. IR232TGSL, is their fastest 1/2" impact wrench. This wrench features 625 ft./lbs. of torque in reverse, with 10,000 rpm to deliver pit crew power, speed and durability for shop tasks. The ThunderGun weighs just 6 lbs. and also includes an adjustable power regulator.