Our double-sided whetstone is crafted from superior corundum, offering a fine and coarse grain side. The fine side is perfect for removing imperfections, while the coarse sharpens blades and tools. This blade sharpener stone is perfect for a wide range of blades and tools. It can be lubricated with either oil or water, and it's ideal for removing imperfections in blades as part of a blade maintenance process. To lubricate this sharpening stone simply soak it in water for 5-10 minutes before use, or apply a layer of thin oil and allow it to soak into the stone.