1. Double-sided sharpening stone - combines coarse sharpening and fine sharpening to meet different needs. Different faces can be used to sharpen different types of tools. Pay attention to the position of the handle when using to avoid bending your fingers. 2. Easy to use - The sharpener uses a diamond surface to sharpen knives and tools faster than traditional stones. No oil or water is required. 3. Application - The sharpener is used to sharpen Swiss pocket knives, metal knives, scissors, outdoor tools, garden tools, agricultural tools. 4. Sophisticated design -- The sharpening stone has a concave handle end to prevent the handle from falling apart during use and to prevent the fingers from bending. 5. Foldable design - The diamond sharpening stone can be folded like a folding fan to provide good protection against damage. Easy to carry and suitable for outdoor use.