Dual purpose with compact convenience, the Double Sided Diafoldr Sharpener from DMT offers two 4″ x 1″ Diamond WhetstoneT surfaces in one lightweight, portable sharpener. It has multiple uses on blades, kitchen knives, specialty and garden tools, etc. The Extra-Fine diamond (9 micron / 1200 mesh) side polishes and refines a razor edge after sharpening with a coarser diamond. The Fine diamond (25 micron / 600 mesh) side is perfect for creating a razor sharp edge. Convenient size: 9 1/2″ open. 5″ closed. Folding plastic handles protect sharpener when not in use. Sharpens in a fraction of the time required by conventional stones. No messy oils needed-sharpen dry or with water. Durable construction will provide years of consistent performance and reliable service.