Metal Sharpeners Grinder Stainless Steel Eco-Friendly Kitchen Woodwork Tools. Simple structure, easy installation and use. The grindstone can be used after being soaked in water until bubbles appear, without expensive grinding oil/grinding oil. This world-class sharpener can be applied to all kinds of tools. The handle is above the blade. It’s very safe and won’t hurt your hands! Before use, please immerse the stone in water for a period of time until bubbles appear. Then you can take out the grindstone and drop a few drops of water on the stone to prevent the stone from drying during grinding and effectively prevent the stone from being easily worn. You can also use a few drops of soap in water to supplement lubrication. In this way, the grindstone will not produce dust during use, and you can make your knife sharp again. After use, please clean dry white stone and put it into normal temperature and dry environment to avoid high temperature and humidity. If there is a problem with the product, please contact our online customer service first. We believe we will give you a satisfactory solution.