4-in-one knife sharpener: Unlike 3-in-one knife sharpeners on the market, our knife sharpener has four notches to meet your different needs. Notch 1 is for rough grinding of blunt metal blades, Notch 2 is for tungsten steel sharpening of very blunt metal blades, Notch 3 is for fine grinding of the blade edge, and Notch 4 is for scissors. . Non-slip rubber base + ergonomic handle: The ergonomic handle provides comfort and makes it easier to grip. Our 4-stage knife sharpener is equipped with a non-slip base to prevent the tool from slipping during sharpening. . Suitable for almost all knife types: Our sharpeners can sharpen knives, carving knives, chef's knives, scissors, and fruit knives of all sizes (except serrated blades and ceramic knives such as bread knives). . Easy to use: The professional kitchen sharpener is designed for user-friendliness. Simply place the blunt blade into the sharpening slot and pull it back 5-8 times until your knife is sharp enough. TIP: To achieve the best possible effect with this knife sharpener, sharpen your knife in only one direction.