DMT FFHWC Diafold Hook And Knife Sharpener Coarse Portable, lightweight with convenient fold & go handles which enclose and protect the diamond whetstone when not in use Coarse diamond to transform a dull edge. Milled groove for sharpening fish hooks 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 Coarse diamond to transform a dull edge. Milled groove for sharpening fish hooks 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