Jon Bhandari Diamond Stone Coarse features multiple layers of micron-sized monocrystalline diamonds bonded in nickel to a flat metal surface. The unique overlapping oval hole design speeds sharpening by collecting and holding the metal fillings which ordinarily builds up during the sharpening process. This allows the sharpening surface to remain clean and clear and speeds sharpening. This product is excellent for sharpening side woodworking tools, medium to small sport/utility knives, or kitchen knives. It is a quick cutting general purpose sharpening stone that will be appreciated by woodworkers, culinary enthusiasts, hunters, fisherman and craftsmen. Monocrystalline diamond on a unique interrupted surface speeds abrasive action and remains clear and efficient. Diamond stones are fast, always remain flat, are indestructable and require only water as a lubricant.