Mark V Lab #56027 Metapol 3B3V Series Bench Top Metallurgical Grinder/Polisher with Dual Wheels, The Metapols feature: Cycle Timer, Variable speed (50-1000 rpm) operation, preset fast speed buttons (200, 400, 600 rpm), auto mode (programmable speed, direction and time), tough and rugged GRP (glass reinforced plastic)non-corrosive body construction, water inlet and outlet for wheel lubrication. Metapol 3B3V utilizes 8" or 10" Aluminum Quick Change Wheels and comes with Splash Guards. The Metapol Polishers are available in 110V 60 Hz. or 220V 50 Hz.