This diamond polishing disc is made of high quality material with diamond coating on one side, which has high hardness, wear resistance and excellent impact resistance, and good electroplated diamond particles provide a long service life[3 different diamond polishing discs]: There are 3 different diamond flat grinding discs, respectively 6001000300, to meet different grinding needs[WIDE APPLICATIONS]: This diamond grinding disc is specially designed for cutting or grinding and glass. Especially suitable for jewelry gem making, such as: polished crystal, , gemstone and jade, etc.[Dimensions]: This diamond grinding disc diameter x arbor hole: 8 inches x 1/2 inches, thickness: 1.5 mm, max. Working speed: 30000rpmColour:SilverMaterial:diamondSize:Outer diameter:200mmPackage Contents:3 * Diamond Polishing DiscOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.