Exhaust replacement is this powerful tool's specialty. Now you can cut off mufflers and tail pipes quickly, efficiently and quietly. It has an 18,000 rpm motor that can handle the toughest exhaust replacements and cut sheet metal nuts and bolts. 3/8” arbor x 2 7/8 wheel size. Fast, quiet operation. Contoured lever throttle with positive self-locking action. Built-in speed regulator. 360° rotatable chrome-plated spark guard.