The 4˝ x 1˝ sized diamond sharpening stone is mounted on a plastic base and has a plastic lid to protect the stone … These surfaces contain multiple layers of micron-sized moncrystalline diamonds and a unique sharpening … It has an interrupted surface that speeds sharpening, with a 750 grit diamond surface. Qty. View Specs. This keeps the sharpening surface clean and working effectively. This keeps the sharpening … The 4” Coarse Diamond Sharpening Stone … Add to … Smith's® 4'' Diamond Sharpening Stone with Cover features Smith's patented interrupted diamond surface which speeds the sharpening process bycollecting and holding the metal filings removed from the knife or tool edge during sharpening. Smith's 4" Diamond Combination Bench Stone features coarse and fine grit sharpening surfaces. Smith's® new 4” Coarse Diamond Sharpening Stone (item # 50924) features Smith’s patented interrupted diamond surface which speeds the sharpening process by collecting and holding the metal filings removed from the knife or tool edge during sharpening. These surfaces contain multiple layers of micron-sized monocrystalline diamonds and a unique sharpening … Smith's 4" Diamond Sharpening Stone-Fine offers the ultimate in sharpening technology. Smith's 4" Diamond Combination Bench Stone features coarse and fine grit sharpening surfaces. It features multiple layers of micron-sized moncrystalline diamonds bonded in nickel to a flat metal surface. The Smith's 4" Diamond Sharpening Stone is perfect for sharpening knives and hooks.