According to Kai Corporation, if you only have one whetstone, a medium grit is recommended. Please understand that there are scratches on the whetstone before purchasing. It will be sent via Letter Pack. - Model Name: Medium Grit Whetstone - Size: Approximately 20cm x 6cm x 3cm - Material: Artificial Whetstone - Accessories: With Case - Color: White - Manufacturer: Kai Corporation A genuine whetstone designed by a knife manufacturer for easy sharpening. ● This whetstone has excellent grinding power and is resistant to clogging. ● It is a sharpening stand that pursues ease of use. ● Compatible with both stainless steel and carbon steel knives. ● The newly developed ribs make it non-slip and safe. ● It has grooves to catch the water (slurry) on the whetstone, so it doesn't dirty the kitchen. ● The whetstone can be drained and dried while still set on the whetstone stand, making cleanup easy. ● It comes with a water bottle that allows you to add water to the whetstone surface by touching it with your fingertips. AP-0303 Medium Grit Whetstone Quality Indication Medium Grit Whetstone: GC#1000 equivalent Stand: ABS resin (heat resistant temperature 80 degrees Celsius) Non-slip part: Synthetic rubber ● Knives tend to be forgotten to be sharpened. Set a schedule and sharpen stainless steel knives at least once a month and carbon steel knives at least twice a month. This will maintain good sharpness. To sharpen properly, sharpen in the order of coarse grit whetstone → medium grit whetstone → finishing whetstone, but a medium grit stone is sufficient for everyday maintenance. How to Sharpen a Knife ● Remove the whetstone from the sharpening stand and soak the whetstone in water until no more bubbles come out. ● Set the whetstone on the sharpening stand and add about 5mm of water to the water bottle. ● Place the whetstone on a flat surface and maintain an angle of about one chopstick's width (about 15°) when placing the knife. ● Place your hand and move it slowly back and forth. Apply force when pushing and release force when pulling. Sharpen both the front and back of the blade the same number of times. ● The muddy liquid that comes out while sharpening is the slurry needed to sharpen the blade, so do not wash it away until you are finished sharpening. ● Also, if the surface of the stone becomes dry, add a few drops of water from the water bottle to the surface of the whetstone with your fingertips. ● Sharpen the front and back of the blade at the same angle and with the same force. ● For single-edged knives, sharpen the front of the blade dozens of times, and sharpen until a "burr" can be felt on the front of the blade with your finger. Once the "burr" appears, place the back of the blade (the side where the burr appeared) firmly against the whetstone and gently pull it 1-2 times. Once the "burr" is gone, the sharpening is complete. Kai Corporation Year-end Cleaning Maintenance Servicing Kitchen Sharpener