Smith's SMDBSF diamond bench stone, fine features multiple layers of micron-sized monocrystalline diamonds bonded in nickel to a flat metal surface. This diamond bench stone measures 6 inch x 2.5 inch in size offers the ultimate in sharpening technology. Smith's SMDBSF diamond bench stone has unique overlapping oval hole design speeds sharpening by collecting and holding the metal filings which ordinarily build up during the sharpening process. This allows the sharpening surface to remain clean and clear and speeds sharpening. Smith's SMDBSF diamond bench stone is excellent for sharpening wide woodworking tools, medium to small port/utility knives, or kitchen knives.