2-level sharpening system: designed with a two-level sharpening system, coarse sharpening for dull knives, fine sharpening for polishing the blade. Knife sharpener Exterior: This mini knife sharpener is made of plastic and stainless steel, which is environmentally friendly and durable. Kitchen accessories: This mini knife sharpener is not only suitable for cooking, but also for camping, hiking and other outdoor activities. Wide Compatibility:Sturdy construction can sharpen any type of knife, including kitchen knives, utility knives, paring knives , sharpeners, planers, boning knives, roughing knives and hatchets, but not suitable for serrated blades (such as bread knives). Knife sharpener keychain: with a key ring. Prepare for your next outdoor adventure with this pocket knife sharpener.