This 180mm diamond cup wheel is designed with 20 pieces of special diamond segments. The masive diamond segments bring high grinding efficiency and long lifespan. A wide range of diamond grit can be choose and different bonds are developed for different applications - concrete, marble, granite, etc. What's more, there are 10 extra holes on the edge of the cup wheel. These holes make the water easier to go through and lower the temperature of the grinding segments. The connection of the cup wheels can be 22.23mm, M14, or 5/8"-11. Specifications: Diameter 180mm Segment Type Special Designed Type Segment Numbers 20pcs Application Grinding concrete, marble, granite, etc. Connection 22.23mm, M14, 5/8"-11 Net Weight 1kg Packing 1 piece per hard box OEM/ODM Service Supported