PERFECT VALUE COMBINATION: Perfect Diamond Sharpening Stone Set Replacement Accessories for RUIXIN PRO RX-008 Sharpening System, Kitchen Knives, Camping Knives. 4 different grinding stones: coarse (240,400 grains), medium (600 grains), fine (1000 grains). Uses: Coarse grit can be used to repair severely dulled blades, medium grit can be used to grind dull knives or rusted knives, fine grinding can be used for edges, to strengthen blades and for daily sharpening. Versatile: No need to use water when sharpening knives. This different grit stone set meets all your sharpening needs and can be used for all kitchen knives, camping knives, hunting knives, folding blade knives, scissors, razors, carving tools and other home accessories [Strong and Durable]The diamond sharpening disc is made of diamond, which is tougher and stronger, the powder is not easy to fall off when sharpening, and it is wear-resistant and durable. Material:diamond colour:silver Package Contents: 8 * Diamond Sharpening Stone