Double Sided Diamond Sharpener (400 # and 600 #) This sharpener has 400 coarse grit and 600 fine grit, each with advanced diamond grit technology. The coarse surface grain will quickly restore a damaged or dull edge and the fine surface grain allows you to bring back a razor sharp edge. The diamond sharpener guarantees an efficient and precise sharpening result. Folded pocket knife sharpener, less risk of damaging the edges. Portable, lightweight with convenient fold design, easy to carry. High precision grinding to guarantee an efficient and precise sharpening result. Ideal for outdoor tools, kitchen knife, machine tools, woodworking tools, garden tools, cutlery knives, etc. Product description Specifications: Color: Black Material: Nickel-plated diamond + ABS handle Sand surface size: 100x20mm Overall dimensions (closed condition): 125x30x15mm Overall dimensions (open condition): 225x30x15mm Function: widely used for grinding outdoor knives and garden tools Double-sided dual-purpose: 400 mesh coarse surface, 600 mesh fine surface Net weight: 61g Durable construction with consistent performance and reliable service. Quick and easy way to sharpen knives. Safety design to protect your hands. It's easy, when you're outside you can wear it. Scope: Outdoor tools, kitchen knife, machine tools, woodworking tools, garden tools, cutlery knives etc. Product use First sharpener cover open, perform one or both of the following steps depending on the blunt nature of the blades. 400 grit for coarse sharpening: suitable for a sharper knife. Start the coarse 400 grit of the stone, move the blade back and forth across the stone at an angle of 10 - 30 ? using light pressure. Usually sharpen the coarse-grained tools every six months as needed. 600 grit for fine sharpening; It is a necessary step for the removal of burrs on the knife, and makes the blade smooth and shiny. It is recommended to do this about once a week. Clean the knife with water or a wiper and dry it after use and clean the sharpener with a broom brush. Note: Please keep the sharpener sharp when sharpening. Please put the sharpener firmly to prevent the diamond surface from getting contaminated after use. The package includes: 1 * Diamond sharpener