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" down to 1/16" at the tip. The monocrystalline diamond is fine grit to create a razor sharp edge in a fraction of the time required by conventional stones, and sharpens dry or with water. Folding plastic handles protect sharpener when not in use. Made in USA.