Easy counter or bench use with larger, wider diamond surface for sharpening a variety of knives and edges Two sided: Extra-Fine diamond to polish and refine an edge and Coarse diamond to transform a dull edge Sharpens knives faster than conventional stones with DMT's micronized monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of performance and reliable service, Weight: 0.55 pounds, Manufacturer: Acme United Corporation