DMT FWMEF-H Double Sided Diafold Sharpener with Fine/Extra-Fine Hard Coat Surface Portable, lightweight with convenient fold & go handles which enclose and protect the diamond whetstone when not inuse Two sided: HC Extra-Fine diamond to refine an edge and HC Fine diamond for a razor sharp edge-includes a continuous surface for pointed edges Sharpens any knife faster than conventional stones with DMT's monocrystalline diamond surface Designed to hold up to the rigors of ceramic blade sharpening -no oil is needed-sharpen dry or with water Durable construction will provide years of consistent peformance and reliable service