This air cut off tool cuts off mufflers, tail pipes, sheet metal, nuts, bolts and more. It features positive, self-locking action. Chrome-plated steel spark guard rotates 360 degrees. Steel shield deflects debris away from operator. Built-in regulator. Min. Hose Size (in.): 3/8, Air Inlet Size (in. NPT): 1/4, Air Consumption (CFM): 10, Speed (RPM): 18,000