1.?? DOUBLE-SIDED SHARPENING?? The portable Diamond Folding 5" Knife Sharpener 400/600 Grit features a coarse side, and a fine side. Coarse 400 grit (38 micron) for quick edge setting; Extra fine 600 grit (23 micron) for honing. 2.??DIAMOND-ELECTROPLATED ADOPTION?? Ensure efficient and sharp sharpening result. Sharpens knives and tools faster than conventional stones with DMT's monocrystalline diamond surface. No oil is needed-sharpen dry or with water. 3.??INTIMATE  DESIGN ??Surface is honeycomb, the interrupted sharpening surfaces allow you to speed up your sharpening by collecting the metal filings that accumulate. Stripe is on the handle which can play a important role in anti-skid. The design of concave and convex ombining on the tail end of handle prevents handle dislocation when you use it, and avoid s folder your fingers. The fan-shaped and folding const ruction provides great protection to the stones, preventing from damage. 4.?? PORTABLE& SPACE SAVER ??Compared to the traditional knife sharpening system,  folding sharpening tool is small but functional. Only 4.9inch length and 1.2inch height. Fit well in your pockets and bags. Folding handle is also an excellent extra. 5.?? WIDELY APPLICATION??Swiss Army Knife, metal knives, ceramics knives, scissors, outside tools, garden tools, agricultural tools. Your camping or home kitchen necessity.