Optimal Size for Versatility: Each disc features a 6-inch outer diameter and a 3.5-inch inner diameter, perfectly sized for a variety of grinding and polishing tasks. This 2-piece set is designed to meet both your routine and intensive processing needs effectively. Engineered for Efficiency: The 150mm CSD discs are designed with a central hole to minimize grinding noise and reduce dust production. A ring edge on the back ensures a secure fit to your impact wrench, facilitating easy installation and stable operation during use. Powerful Cleaning: Engineered to swiftly and efficiently clean rust and dirt from wheel hubs and brake discs, these discs help prevent -related distortion. Their design ensures they do not damage the surfaces, providing a uniform cleaning effect that extends the life of metal components. Flexible Tool Compatibility: These nylon coarse grinding discs are compatible with both air and electric drills, offering versatility in your tool choice. The construction ensures a consistent and wear- performance across a wide range of processing tasks. Color: & Black Material: Nylon Silicon Carbide Package Contents: 2 * Coarse Cleaning Discs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.