DMT D2K 2.5-inch Dia-Sharp Diamond Mini-Hone Kit of C, F, E Superior Diamond Sharpening Stones Legendary quality Made in the USA Comfortable and easy access to edge care in confined areas Three different diamond stones: Extra-Fine to polish and refine an edge, Fine for a razor sharp edge and Coarse to transform a dull 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