ORBITAL ACTION Similar to the model 3806, the 3800-4 is designed for marine and industrial applications where a larger footprint is required. The big 4 1/2" x 16" pad delivers a whopping 72 square inches of sanding surface. The additional surface area also adds stability to the tool for ease of operation. The powerful air-Efficient motor with 5 point suspension guarantees uniform, performance sanding. Pad size 4 1/2" x 16".