DualSided Diamond Design 400 coarse grains provide quick edging, while 600 ultrafine grains deliver a polished finish. No oil is needed; grind dry or use water. Choose the grit based on the tool condition to achieve the desired grinding effect. Widely Compatible Diamond sharpening stone is suitable for sharpening kitchen knives, scissors, utility knives, shaving tools, and more. A versatile pocket tool that meets sharpening needs in both home and work environments. Easy to Use and Carry Effectively repairs and polishes various gardening tools, knives, and scissors. Portable folding design allows storage in a pocket or tool kit, making it convenient to carry and use wherever needed. Foldable and Protective Design Equipped with a foldable plastic shell to protect the interior sharpening stone. Handy for outdoor use; its compact design enables worry sharpening during outdoor activities.