KNIFE SHARPENER: The small and ultra-thin diamand sharpening stones perform easy, efficient and sharp sharpening and polish. TWO CHOICE: Double sided diamond design for best choice.(400 Grit as coarse sharpen, 600 Grit for fine honing) PORTABLE FOLDING DESIGNFolding plastic shell protects the inner sharpening stone well and makes it convenient to carry, for outdoor use. FeatureSharpening surface is honeycomb,so it can sharpen faster and more efficient than the oval-shaped sharpening surface. Stripe is on the handle which can play a important role in anti-skid. The design of concave and convex combining on the tail end of handle prevents handle dislocation when you use it, and avoids folder your fingers. The fan-shaped and folding construction provides great protection to the stones, preventing from damage. APPLICATION SCOPEIt fits carring around for outdoor activities ly .Kitchen knives.(Metal knives,Ceramics knives, Scissors, Outside knives, Garden knives, and Agricultural knives.