KNIFE SHARPENER: Small and ultra-fine diamond sharpening stones provide easy, efficient and sharp sharpening and polishing. TWO CHOICES: Double-sided diamond design for the best choice. PORTABLE FOLDING DESIGNThe folding plastic shell protects the internal sharpening stone well and makes it convenient to carry, perfect for outdoor use. FIELD OF APPLICATION It adapts perfectly to outdoor activities. Kitchen knives (metal knives, ceramic knives, scissors, outdoor knives, garden knives and agricultural knives. PERFECT DESIGN The sharpening surface is honeycomb, so it can be sharpened faster and more efficiently than the oval sharpening surface. Stripe is on the handle which can play an important role in anti-skidding.