Perfect fit at home or in the shop offering a sharpening surface to satisfy a variety of edge care needs Fine diamond for a razor sharp edge Sharpens knives faster than conventional stones with DMT’s monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service. High technology combines the hardness of diamonds with the toughness of plastic to give you excellent sharpening results. Fine monocrystalline diamond particles are permanently fixed to a flat plastic base in a unique screen pattern. Water is used as the lubricating wash for sharpening all tool steels, even carbide edges. They work for home and shop use with minimum cleanup and care.