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SUNJOYCO 4 to 4.5 inch Diamond Cup Grinding Wheel 12/14 Segments Heavy Duty Turbo Row Concrete Grinding Wheel for Angle Grinder, Granite, Stone, Marble, Masonry, Concrete Warm Tips: Please check the size of the wheel to see if they can compatible with your gender! If do not fit your gender or do not know how to use, we are willing to offer you help. Specification: Material: HHS Production process: sintering Color: Gold/Black/BuleOuter diameter: 100 mm /4 inch Inner hole diameter: 20mm / 0.79 inch (without the metal ring) Inner hole diameter: 16mm / 0.63 inch (with metal ring) Outer diameter: 115 mm /4.5 inch Inner hole diameter: 22mm / 0.87 inch (without the metal ring) Inner hole diameter: 16mm / 0.63 inch (with metal ring) Outer diameter: 125 mm /5 inch Inner hole diameter: 20mm / 0.79 inch (without the metal ring) Inner hole diameter: 16mm / 0.63 inch (with metal ring)