DMT 10-in. DuoSharp Bench Stone for Fine/Coarse with no base. Precision flat, two-diamond surfaced sharpener guaranteed to provide consistent, even sharpening every time. Two sided sharpening in coarse diamond to transform a dull edge and fine diamond for a razor sharp edge. Sharpens knives faster than conventional stones with DMT's micronized monocrystalline diamond surface. No oil is needed-sharpen dry or with water.