Portable, lightweight with convenient fold & go handles which enclose and protect the diamond whetstone when not in use.Two sided sharpener with Extra-Fine diamond to polish and refine an edge and Fine diamond for a razor sharp edge.Sharpens knives and tools 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.