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Sharpening stones, water stones or whetstones are used to sharpen the edges of steel tools and implements through grinding and honing.
They come in a wide range of shapes, sizes, and material compositions.
Stones are usually available in various grades, which refer to the grit size of the abrasive particles in the stone. Grit size is given as a number, which indicates the spatial density of the particles. A higher number denotes a higher density and therefore smaller particles, which leads to a finer finish of the surface of the polished object.