Use: Diamond grinding wheel for precision machining of glass, glass thickness, jade, and other building materials. Correct use: Electric drill speed 3600 rpm, bench drill and machine speed between 6000 to 10000 rpm. Water cooling is required during use to achieve optimal results. Selection guide: For materials with a thickness of 8mm, select an 8mm diamond grinding wheel. Specification: Shaft diameter: 6mm Outer diameter: 20mm Grit: 150 Width: 2mm Color: As shown Material: Electroplated diamond abrasive Package Contents: 1 x Diamond grinding wheel Note: The package includes only the items listed above. Other products are not included. Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3cm.