DMT DMG-4 Magna-Guide Quad Kit with 4 Diamond Grits EE / E / F / C Portable, lightweight with convenient fold and go handles, which enclose and protect the diamond whetstone when not in use Four diamond stones in extra-extra fine, extra-fine, fine and coarse 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 Four diamond stones in extra-extra fine, extra-fine, fine and coarse 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