The Diafold Serrated Knife Sharpener not only maintains serrated edges, but also serves as a mini-steel, gut hook sharpener and conical file. The taper of the sharpener measures 1/4" at its widest point down to 1/16" at it's narrowest. Convenient size measures 9 1/2" long when open and 5" when 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. Fine diamond (25 micron / 600 mesh) for a razor sharp edge. Portable, lightweight and convenient. Fold & go handles enclose and protect the diamond serrated sharpener when not in use. DMT's monocrystalline diamond surface sharpens knives faster than conventional stones. No oil is needed, simply sharpen dry or with water. Durable construction will provide years of consistent performance and reliable service.