4 in 1 KNIFE SHARPENER: Our knife and scissor sharpener comes with 4 slots which can sharpen all types of blades. Slot 1 is for Scissors Grinding. Slot 2 is Coarse Grinding for dull metal knives. Slot 3 is Medium Grinding for daily usage. Slot 4 is Fine Grinding for Ceramic Knife or finishing and polishing edges. EASY TO USE: Professional Kitchen sharpener is designed to be user friendly. Simply put the dull blade on the sharpening slot and pull it backward 5-8 times until your knife is sharpen enough. HINT: In order to get the best effect out of this knife sharpener, sharpen your knife with one direction only. NON-SLIP: Knife sharpener with heavy duty non-slip rubber under its bottom which provides more stability base when sharpen your knife. ERGONOMIC HANDLE SAFE: Ergonomic designed handle provide comfortable and easy grip, far away from sharpening rods, secure your safety. PREMIUM PRODUCTEXCELLENT SERVICE: For better quality of the knife sharpener, PLEASE ONLY PURCHASE from YIXIAN store. If you are not satisfied with our knife sharpener, please contact us at anytime to assist you. Caution: Our knife and scissor sharpener is not for use on serrated knives or scissors.Handle with care when trying to sharpen ceramic knives.If misused, scratches may appear on ceramic knives edges.