The Ingersoll Rand 3/8 in. Butterfly Air Impact Wrench is handy for the cramped spaces common to small engine repair and other general service work. The butterfly-style throttle valve lets you adjust speed smoothly in either direction in one continuous motion. Delivers 200 ft-lbs. of maximum torque Contoured composite butterfly throttle for comfort and control Recessed regulator dial Puts power and ergonomics in the palm of your hand 3/8 in. Butterfly Air Impact Wrench - 216B .