[Application] Specially designed for sharpening sickles. [Types of whetstones and selection] 1. If the knife is nickel plated: coarse stone (#80 - #400). 2. If the knife is dull: medium stone (#700 - #1200). 3. MORE SHARPENING: finishing stone (#3000 - #8000). [How to use Sharen] Pening Stone] 1. Whetstone approx. Soak in water 3 minutes before use. 2. Please stabilize the whetstone. The knife blade should be held at an angle of 15-20 on the whetstone. 3. Blade Type: Single edge knife should be sharpened 90% on the surface and 10% sharpened on the back. Double-edged knife. The double-edged knife should be sharpened evenly on both sides. 4. After sharpening, slightly sharpen the back of the knife about a few times to remove the burrs. Maintenance The whetstone is dent from time to time, so it is necessary to maintain it with waterproof paper or sandpaper. After using the whetstone, wash it with water and dry it in a shaded area. KING DELUXE is a product designed as a grinding wheel for sharpening each knife from special abrasive, so that the quality is durable and sharpness is maintained. The KING whetstones have solved problems such as damage to the whetstone caused by the tip of a knife and the unbalanced or uneven hardness of the whetstone. With many years of experience, our artificial whetstone shows more sharpness than other natural whetstones. The product is made in Japan and meets the high standards of an experienced sushi chef, a line of culinary work where a sharp knife can make the difference between a delicious piece of fish and something completely inedible.