Ingersoll Rand 244A 1/2-Inch Super Duty Air Impact Wrench Easy-to-service two-piece construction Pressure-feed lubrication Contoured handle for comfort and control Patented one-hand forward/reverse for easy operation Powerful, with smooth, balanced blows Pressure Feed Lubrication System automatically greases the impact mechanism Working torque: 40-350ft/lbs Pressure feed lubrication Pressure feed lubrication system automatically greases the impact mechanism