5" (127 mm) Dia. Non-Vacuum Dynorbital-Spirit Random Orbital Sander. 25 hp 12000 RPM 3/16" (5 mm) Dia. (NOTE: Comfort Platform is removable.). Order 59330 Comfort Platform (U.S. Patent No. Throttle lever recesses into housing grip when depressed, eliminating pressure-point on operator's palm. ).