YKING Non Woven Polishing Wheel for Bench Grinder Size:- 150 MM X 25 MM ( 6" X 1" ) 150 MM X 50 MM ( 6" X 2" ) 200 MM X 25 MM ( 8" X 1" ) 200 MM X 50 MM ( 8" X 2" ) Hardness:- U-00, U-0, U-1, U-3, U-5, U-7. Flexibility : Non-woven abrasives readily conform to any work surface. Consistency : Non-woven abrasives give a consistent performance throughout the life of the product. Non-loading : Due to their open structure, they resist clogging. High surface finishing. Last Longer, Suitable for Metal, Steel.