Knife and Scissors Sharpener is designed with 3-step system,easy to use:1)simply pull your knife with 1st stage for repairing and straighening damaged bldes;2)The 2nd stage help knife's V-shape;3)The 3rd stage tunes for a clean polish.4)The 4th stage is designed for your scissors,open the two blades and pull it as you sharpe your knife.Compared to other knife sharpeners' base,ours are made of silicone instead of cheap rubber,you'll NO worry shaking back and forth when sharpening;rubber hanging ring design help save your place(hang it everywhere)4-stage sharpener is designed with a foucus point for your thumb,increasing the stability of the ,so that you can put your thumb to the point and keep it still.Would be for your hand while sharpening;perfect both for right and left-handed.With professional knife sharpener,you 't have to be a chef to like one! Crafted from solid ABS plastic,it's strong,durable,unlike other items, chef knife sharpeners have passed the 3000-time service life test,which means if you have 5 knives,and sharpen a week,you can keep it for 11 years!(Those who tell you theirs can last a lifetime must be liers)Colour:Black Material:Stainless steelSize:22.5*10.5*4.5cmPackage Contents:1*knife sharpener