Japanese King KDS Sharpening Stone, 1000/6000 GritStones are the best way to grind, sharpen, and polish a cutting edge. This method is also used by Japanese knife manufacturers.The King KDS 1000/6000 sharpening stone is a flat, rectangular stone with dimensions of 207x66x36mm and grits (number of grains, abrasive particles per cm²) of 1000 on one side and 6000 on the other. This universal set is ideal for regularly sharpening undamaged cutting edges (grit 1000), as well as for polishing blades and giving edges super sharpness (grit 6000). The pure material used to produce these stones is aluminum trioxide (corundum).King is a brand of MATSUNAGA STONE CO., LTD., founded in 1948, which specializes in the production of various types of abrasive materials, including knife sharpening stones. The high quality of our products has made King stones recognizable and highly valued around the world. Knife Sharpening:Gradation Selection 220 - 600 for a very dull knife or one with a damaged, chipped cutting edge 800 - 1200 for regularly sharpened, slightly dull knives 1500 - 6000 for final smoothing and polishingSharpening1. Soak the stone in water for a few minutes before use. The stone should be wet at all times while sharpening. 2. Place the stone stably on the countertop. You can place a damp cloth or paper towel under the stone to prevent the stone from sliding. The knife should be positioned at a 15-20 degree angle to the stone. 3. Depending on the type of blade: - single-sided sharpened knife - sharpen 90% on one side and 10% on the other- double-sided sharpened knife - sharpen equally on both sides4. After sharpening, remove any burrs from the cutting edge. To do this, position the knife perpendicular to the stone and, maintaining this angle, gently slide it along the entire cutting edge, alternating between one side and the other. MaintenanceThe stone should be thoroughly washed and dried after use. Over time, dents may appear on the surface, which should be leveled, for example, with a special smoothing stone.