Mark V Lab #56011 Metapol 2B3V & Metapol AV Series Bench Top Metallurgical Grinder/Polisher with Single Wheel, 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 2B3V utilizes 8" or 10" Aluminum Quick Change Wheels and comes with Splash Guard and Cover. Metapol AV utilizes 12" or 14" Quick Change Wheels and comes with Splash Guard and Cover. The Metapol Polishers are available in 110V 60 Hz. or 220V 50 Hz.