THIS IS A 8" ORBITAL SANDER. This is a Dynabrade Mud Hog 2-hand gear driven sanders give you the power to level filler fast, just like the pros! These Mud-Hog sanders have high-torque, gear driven motors that have adjustable speed control up to 900 rpm & feature a soft grip housing that insulates them from the cold. These Dynabrade Mud Hog sanders also offer unique cutting action for efficient material removal. The balanced 8" urethane pad produces consistent results & operates via a 1/4" inlet, consuming 3 cfm at 90 psi.