DMT OD2F 2-1/2-Inch Dia-Sharp Mini-Hone Fine Superior diamond sharpening stones Legendary quality Made in the USA Provides easy access to edge care in awkward, confined areas 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