Water Polishing Professional Stained Grinder Polishing for DIY Glass Ceramic Description: Automatic Stained. Stable and reliable performance. Dents switch design , avoid the leakage. Glass, ceramics, such as grinding hard brittle materials. Grinding variety of geometric shapes: plane, curve, rounded corners, slope, etc Grinding wheel installation: 1. Before installation of grinding wheel, topped with lubricant, engine shaft grinding wheels need to apply a layer of lubricant inside. 2. The grinding wheel mounted to the engine shaft, the fixed screw position higher than the engine shaft. The position of the grinding wheel on the axle must be at least 1/8" diamond part above the operating table. 3. Fixed grinding wheel on the shaft with hexagonal wrench clockwise. Note: Maintain stability of the grinding wheel installed in the engine shaft of the plane. Specifications: Color : Blue Speed: 4200r/min Voltage: 220V Size Chart: 19.5x15cm/7.68x5.91inch Package Includes: 1 Piece Glass Grinder