Size - This diamond gem jewelry grinder has a diameter of 6 inches (150 mm) and 1 inches (25 mm) thickness, 1 inches (25 mm) shaft and 100 particles. Material - Made of high hardness diamonds, this gem grinding wheel is durable, wear-resistant and scratch-resistant, allowing for quick cutting and grinding, ensuring more efficient and high-precision grinding. Diamond coating adheres evenly to the surface of the grinding wheel, has strong adhesion and is not easy to lose sand, ensuring long-term use.Using ABS plastic core, the diamond grinding disc runs smoothly and does not produce excessive noise when rotating at high speed. Application - Suitable for grinding and trimming various superhard materials, such as gemstones, marbles, ceramics, glass, tungsten steel, carbides, crystals, etc.Suitable for most bench grinders and workbenches. Note - Diamond grinding wheels can be used in dry and humid environments.It is recommended to wet and wipe dry after use to prevent rust. Specification:400 Grit/100 Grit/240 Grit/120 Grit/320 Grit Colour:As Shown Material:Metal + Plastic Package Contents: 1 x grinding wheel Only 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.