High hardness, good shape retention, long service life and high grinding efficiency. The diamond sand is evenly attached and wear-resistant, and it is not easy to drop sand. Suitable for grinding hard alloy, non-metallic materials, cutting hard and brittle carbide, non-metallic minerals. Mainly used in hard alloy measuring tools, tungsten steel, high speed steel, alloy steel, glass,precious stones, magnetic materials, ceramics, , etc. : Diameter:45mm/45 x 45mm/20mm Inner hole:6.35mm/3mm Material: Emery colour: silver Package Contents: 3 x Diamond 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.