Description: High speed of grinding, long service life This cup grinding wheel provides for very fast cutting action on masonry, stone and concret Diamond millstone generally applicable to the grinding of marble, granite, ceramic, artificial stone and glass, etc Can be used for DIY grinding and polishing wood, metal and mold Suitable for use on grinding on marble, tile, concrete, cranite and rock, etc. Specification: Material: Metal Diameter Size: Approx. 50 mm / 1.97 inches,Thickness Size: Approx. 20 mm / 0.79 inches Diameter Size: Approx. 56 mm / 2.21 inches,Thickness Size: Approx. 20 mm / 0.79 inches Package Includes: 2 Piece Diamond Grinding Wheel (The color will be shipped by random) Note: Please allow a little size error due to manual measurement. Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the item's color may be slightly different from the pictures. Please understand.