4 Levels sharpener: the manual sharpeners are made of high quality stainless steel, the first stages apply to the grinding of scissors, the second to the rough grinding of the tungsten steel blade; the third diamond-coated fine grinding; the fourth ceramic slot - precision polishing. Ergonomic Design: Smart knife sharpeners feature a comfortable handle for maximum grip, suitable for both right and left handed users. Heavy-duty non-slip base for ultimate stability and safety. Easy to Use: Sharpening the knife takes just seconds, meaning dull knife can be sharpened again quickly and efficiently. Range : Kitchen knives and scissors with straight steel blades, including knives with hardened steel blades.Wavy knives are not included. Knife dullness grade 1: if your knife is a little dull t is not easy to cut the pork belly with the skin on), please use No. 4 hole to grind 5 rounds. Blade dullness 2: If your knife is very blunt (it is not not easy to cut lean meat), please use hole 3 for 5 turns, then hole 4 for 5 turns. Blade dullness 3: If your knife is very dull ( it is not easy to cut fruits and vegetables), please use No. 2 hole for 10 laps (it can grind steel/edge-like shavings). Length 23cm * width 5, 5 cm * height 9.5 cm Quantity delivered: 1 piece