Mark V Lab Metapol AV Single Wheel, Bench Top Grinder/Polishers Single Wheel Grinder Polisher is available with for 12" or 14" wheels. The Metapol AV Features variable speed (100-1000 rpm), preset fast speed buttons (100, 200, 300 rpm), auto mode (programmable speed, direction and time), tough and rugged GRP (glass reinforced plastic) construction, water inlet and outlet for wheel lubrication. Includes 12" Aluminum Wheel,Splash Guard and Cover.Extra Wheels and Paper Holding Ring are quoted separately. The Metapol polisher has a built-in transformer so it can be operated at either 110V or 220V (factory preset).