Portable, lightweight with convenient fold and go handles, which enclose and protects the Diamond Whetstone when not in use Two sided with Extra-Fine diamond to polish and refine and edge and Fine diamond for a razor sharp edge Sharpens knives and tools faster than conventional stones with DMTs monocrystalline diamond surface No oil is needed, sharpen dry or with water Durable construction will provide years of consistent performance and reliable service Carded