Features: Diamond particle strength are high, a large amount, durable. This aggressive turbo cup grinding wheel provides for very fast cutting action on masonry, stone and concrete. Wheel features air holes designed to aid in maintaining and cooling the cutting pattern and reducing wear. Generally applicable to the grinding of marble, granite, ceramic, artificial stone and glass, etc. Suitable for high speed electric grinder and pneumatic tools. Specifications: Color: as picture show Diameter: 115mm/4.5inch Hole: 22mm/ 7/8inch Quantity: 1pcs Package Include: 1pcs diamond grinding wheel Note: Please allow 1-2mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.