Features: High grinding speed, long service life. Processed with fine quality synthetic diamond coating that provides for a more consistent diamond scratch pattern. With air holes designed to aid in and maintain a cool stable cutting pattern and reduced wear. Used on high-speed electric grinder and pneumatic tools. Provides very fast grinding action on masonry, stone and concrete. Generally applicable to the grinding of marble, granite, ceramic, artificial stone and glass, etc. Suitable for people who do granite and marble worktops, headstones, tilers, builders. Specifications: Material: HHS Production process: sintering Color: gold Diameter: 100mm / 4in Inner hole diameter: 20mm / 0.79in without metal-ring Inner hole diameter: 16mm / 0.63in with metal-ring Thickness: 5mm / 0.2in Package Size: 120 x 120 x 30mm / 4.72 x 4.72 x 1.18in Package weight: 185g / 6.54ounces Note: 1.Due to the different display screen and light effect, the actual color of the item might be slightly different from the color showed on the pictures. 2.Please allow a little measuring deviation due to manual measurement. Package List: 1 x Segment Grinding Wheel Package List: 1 x Segment Grinding Wheel