Diamond grindstone, coarse grinding and fine grinding combine, first coarsely grind for polishing.Place the knife on the diamond surface and keep an angle for about 30. Move back and forward for several times, then change the other side of the knife and repeat the same process.Start with 600 first and repeat on the 1200 side.Design highlights product texture. More efficiency and durability are less risky than waterstones damage margins. Suitable for kitchen knives, blades,etcThis item does not need water during the sharpening process. After shrpening do remember to wash the knife before cutting. For best results, use with water or honing oil. Plate cover keeps surface clean and ready for next project.Do not put the sharpener in the dishwasher or submerge in water.