SUNJOYCO 4'' Diamond Cup Grinding Wheel 12 Segments Heavy Duty Turbo Row Concrete Grinding Wheel for Angle Grinder, Granite, Stone, Marble, Masonry, ConcreteWarm Tips:<br>Please check the size of the wheel to see if they can compatible with your machine!Specification:Material: HHSProduction process: sinteringColor: BlueOuter diameter: 100 mm / 4 inchesInner hole diameter: 20mm / 0.79 inches (without metal ring)Inner hole diameter: 16mm / 0.63 inches (with metal ring)Thickness: 5 mm / 0.2 inchHow to Use It Properly?1. Strictly follow the instructions in the machine manual.<br>2. Do not install a diamond dish/cup wheel that is too loose or too tight on the flange.<br>3. Tighten only with the tool provided with the machine.<br>4. Be sure to hold the wheels properly to prevent slipping, but do not use excessive force. Never use a hammer.<br>5. Keep flanges and threads clean without burrs and rust.<br>6. Before installing the wheel, please replace the deformed or damaged flange.Please protect yourself when start cutting!We recommend the following personal protective equipment:Eye protectionEar protection (earmuffs)Hand protection (gloves)Lung protection (dust mask)Important note:1. Never remove the machine's protective cover and make sure it is properly adjusted to keep debris away from you.<br>2. Make sure that no one else is in danger, especially near the machine while working.Package Included:<br>1 x 4-inch diamond concrete grinding wheel