1Abrasives have the characteristics of high hardness, high compressive strength, and good wear resistance, making them an ideal grinding tool 2The hardness of green silicon carbide is second only to boron carbide and diamond, it is brittle, has sharp abrasive grains, and has thermal conductivity. 3The grinding wheel has uniform abrasive grains, high grinding accuracy, good roughness, low abrasive consumption, and durable. 4Suitable for grinding hard alloys, optical glass, ceramics, gems, agate, honing cylinder liners and other hard and brittle materials 5Long service life because of hard silicon carbide, high stock removal rate, rremoving of burrs. Item Type: Grinding Wheel Material: Green Silicon Carbide Color: Green Product Size: Approx. 75x32x20mm or 2.9x1.2x0.7in (Diameter x Thickness x Aperture) Compatible: For Grinding Hard Alloys, Optical Glass, Ceramics, Gems, Agate, Honing Cylinder Liners and Other Hard and Brittle Materials 1 x Grinding Wheel The newly installed or used grinding wheel every other day should be idling for more than one minute before use. Do not stand in front of the grinding wheel.