DMT D2E 2.5-inch Dia-Sharp Diamond Mini-Hone - Extra-Fine Legendary quality Made in the USA Comfortable and easy access to edge care in confined areas Extra-Fine diamond to polish and refine an 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