DMT FWFC  Double Sided Diafold Sharpener Fine / Coarse Portable, lightweight with convenient fold & go handles which enclose and protect the diamond whetstone when not in use 2 sided with coarse diamond to transform a dull 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