product description 1.4 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. 2.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. 3.NON-SLIP: Knife sharpener with heavy duty non-slip rubber under its bottom which provides more stability base when sharpen your knife. 4.ERGONOMIC HANDLE & SAFE: Ergonomic designed handle provide comfortable and easy grip, far away from sharpening rods, secure your safety. 5.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.