Innovative, multi-patented DuoSharp Bench Stone is a precision flat, two diamond surfaced sharpener guaranteed to provide consistent, even sharpening every time. The 10" counter or bench sharpener offers larger, wider diamond surface for sharpening a variety of edges including shears, cleaver and specialty knives, plane sole, machete, etc. Extra-Fine diamond (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond - Fine diamond stone (25 micron / 600 mesh) for a razor sharp edge. Precision flat, two-diamond surfaced sharpener guaranteed to provide consistent, even sharpening every time. 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.