The Palm Air Impact Wrench from Capri Tools is available with either a 1/2" or 3/8" drive. The wrench features 405 ft-lbs of maximum reverse torque in an ultra-compact package that's just 3-1/3" deep and 2-1/4" wide and weighs only 2.5 lbs. It includes a responsive trigger and ergonomic grip to reduce user hand fatigue. The impact wrenches use a 1/4" NPT air inlet with a low air consumption of 3.4 CFM at 90 psi. The 1/2" drive impact wrench operates at 92.9 dBa, while the 3/8" drive impact wrench operates at 91.1 dBa.