Heavy Duty Contractor PRO Series 4 1/2 Inch / 115mm and 5 Inch / 125mm Diamond Coating Segment Grinding Wheel Specifications * Cup Shape Dome Flange * Outside diameter : 4 1/2 Inch and 5-Inch * Arbor Size : with 5/8"-11 Thread arbor* Professional Grade Contractors Grinding Cup Suitable for use on grinding on marble, tile, concrete and rock. This aggressive double row cup grinding wheel provides for very fast cutting action on masonry, stone and concrete. Engineered to provide 20% faster stock removal. Manufactured with high quality synthetic diamond coating that provides for a more consistent diamond scratch pattern. Wheel features air holes designed to aid in and maintain a cool stable cutting pattern and reduced wear. Design for concrete grinding, leveling and thin coating removal