Wet or Dry Air Sander. Pad Size - 170 x 93mm. Free Speed - 8000rpm. Air Inlet - 1/4 inch. Air Hose - 3/8 inch. Recommended for Wet or Dry sanding. Locking Clamps hold sand paper firmly in position. Contoured Palm Grip for one hand operation. Automatic Release Throttle Lever with Positive Stop Action. Ideal for Metal / Wood and Plastic.