4 Levels Sharpener: manual sharpeners are made of high quality stainless steel, the first stages apply to grinding scissors, the second stages apply to coarse grinding of tungsten steel blade; the third fine grinding coated with diamond; the fourth ceramic slot - precision polishing. Ergonomic Design: Smart knife sharpeners feature a comfortable handle for maximum grip, suitable for 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 that dull knife can be re-sharpened quickly and efficiently.< /p> Usage Range: Straight steel blade kitchen knives and scissors, including knives with hardened steel blades. Does not include corrugated knives. The degree of dullness of the knife 1: If your knife is a little dull (it is not easy to cut pork belly with skin), please use hole No. 4 to grind 5 turns. Dullness of the blade 2: If your knife is very dull (it is not easy to cut lean meat), please use hole No. 3 for 5 turns, then hole No. 4 for 5 turns. Dullness of blade 3: If your knife is very dull (it is not easy to cut fruits and vegetables), please use hole No. 2 for 10 revolutions (it can grind steel/edge-like chips). Length 23 cm * width 5.5 cm * height 9.5 cm Delivered quantity : 1 piece