Check the listing for details. Water-cooled Grinder Electric Knife Sharpener Low Speed Grinding machine 220V E. Condition: New. Listed at 246.04 USD. Deceleration mode: Turbine deceleration. Electric Knife Sharpener Water-cooled Grinder Low Speed Grinding machine 220V. Motor speed: 1450 rpm. Motor type: electric phase induction motor. The motor shell material: Iron plate shell.