High speed of grinding, long service lifeThis cup grinding wheel provides for very fast cutting action on masonry, stone and concretDiamond millstone generally applicable to the grinding of marble, granite, ceramic, artificial stone and glass, etcCan be used for DIY grinding and polishing wood, metal and moldSuitable for use on grinding on marble, tile, concrete, cranite and rock, etc.Specification:Material: MetalDiameter Size: Approx. 50 mm / 1.97 inches,Thickness Size: Approx. 20 mm / 0.79 inchesDiameter Size: Approx. 56 mm / 2.21 inches,Thickness Size: Approx. 20 mm / 0.79 inchesPackage 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.b