Heavy Duty Industrial PNEUMATIC Impact Wrenches Features / Benefits of Heavy Duty Industrial Pneumatic Impact Wrenches Heavy Duty for toughest applications. Highest torque output to weight ratio in industry. Available Twin Hammer or Pin Clutch Mechanisms for maximum versatility. Minimum Noise and Vibration. Available in 1/2 , 3/4”, 1” and 1.1/2” square drives. Uses standard air supply.