1】3-STAGE KNIFE SHARPENING SYSTEM: Our knife sharpeners have a 3-slot design including rough grinding, fine grinding and polishing grinding. This is to ensure that you always have the right sharpener for the demand at the knife, whether it is grinding blunt knives, daily sharpening knives, or polishing grinding&burr. 【2】HIGH QUALITY: The rough grinding part of this knife sharpener uses tungsten steel blades, and the fine grinding is aviation ceramics. Different materials can meet your different