The EdgeWare 6-Inch Diamond Sharpening Stone features multiple layers of micron-sized monocrystalline diamonds bonded in nickel to a flat metal surface. The unique sharpening surface has an overlapping oval hole design that speeds sharpening. It collects and holds metal filings which ordinarily build up during the knife sharpening process. A Diamond Sharpening Stone is excellent for hand sharpening of double-beveled straight edge kitchen knives and single-bevel Asian knives of all sizes. Non-slip rubber feet keep the sharpening stone stable while sharpening. Includes a clear plastic lid.