Japanese sharpening stone King Deluxe S-45B with 4000 gritStones are the best way to grind, sharpen and polish the cutting edge. This method is also used by Japanese knife factories.High-quality sharpening stoneKing Deluxe S-45B 4000is intended for final smoothing and polishing of the blade. The pure material used to produce these stones is digaluminum trioxide Al2O3 (corundum). The stone with dimensions 176x52x15mmand gradation (number of grains, abrasive particles per cm2)4000, was placed on a base of plastic, equipped with rubber, non-slip feet. Kingis a brand belonging to the company founded in 1948MATSUNAGA STONE CO., LTD. which specializes in the production of various types of abrasive materials, including stones for sharpening knives. The high quality of the offered products has made King stones recognizable and highly valued all over the world.Knife sharpening:Gradation selection 220 - 600 when the knife is very blunt or has a damaged or chipped cutting edge 800 - 1200 for regularly sharpened, slightly dull knives 1500 - 6000 for final smoothing and polishingSharpening1. The stone should be soaked in water a few minutes before use. When sharpening, the stone should be wet all the time. 2. Place the stone steadily on the countertop. You can place a damp cloth or paper towel under the stone to prevent it from moving. The knife should be placed at an angle of 15-20 degrees to the stone. 3. Depending on the type of blade: - knife sharpened on one side - sharpen 90% on one side and 10% on the other side -  knife sharpened on both sides - should be sharpened equally on both sides4. After sharpening, remove any burrs from the cutting edge. To do this, set the knife perpendicular to the stone and, maintaining this angle, gently move it along the entire cutting edge, once on one side and then on the other side of the blade. MaintenanceThe stone should be thoroughly washed and dried after use. Over time, depressions may appear on the surface, which should be leveled, e.g. using a special leveling stone.