Feature:1. 2PCS GRINDING WHEELS: The kit includes segment grinding wheel and double row wheel for different grinding situations, and have a wide range of uses.2. AND ALLOY: The grinding wheel is made of and alloy materials, with high hardness and wear resistance, and is not easy to deform or corrode.3. WITH HOLE: The grinding wheel has hole design, which can maintain a good heat dissipation effect, reduce wear and prolong the service life.4. HIGH EFFICIENCY: After the grinding wheel is installed, the maximum speed can 13200RPM, which greatly improves the work efficiency.5. WIDE APPLICATION: Suitable for dry or wet grinding of concrete, granite, marble, tile, masonry and some other building stone materials.Specification:Item Type: Grinding WheelMaterial: Diamond, AlloyOuter Diameter: Approx. 115mm / 4.5inCenter Hole Diameter: Approx. 22.23mm / 0.88inMaximum Speed: 13200RPM Package List:2 x Grinding WheelsNote:1. The machine must have a protective cover, and the product must be clamped on the machine.2. Wear goggles, ear muffs and gloves when operating.3. There should be no between the aperture of the product and the rotating shaft of the machine. If it does not match, adjust with a suitable washer.4. When using it, both hands must hold the machine tightly and operate it smoothly. If the working part is loose, it is strictly prohibited to use it.5. Suitable for grinding stone and concrete.