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 restore 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 high quality silicone instead of cheap rubber,you'll NO LONGER worry its 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 our professional knife sharpener,you don't have to be a chef to cook like one! Crafted from solid ABS plastic,it's strong,durable,unlike other items,our chef knife sharpeners have passed the 3000-time service life test,which means if you have 5 knives,and sharpen them once a week,you can keep it for almost 11 years!(Those who tell you theirs can last a lifetime must be liers) Colour:Black Material:Stainless steel Size:22.5*10.5*4.5cm Package Contents: 1*knife sharpener Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.