From Victorinox, this knife sharpener features: quickly resharpens dull knives ergonomically-designed handle comfortable for right- or left-handed use finger guard for protection when sharpening V-shaped plates placed at angles to achieve the perfect razor-sharp angle each and every time it's used hand wash lifetime warranty against defects in material and workmanship Imported. How to Use: Place the sharpener at the base of the cutting edge. Slide it along the edge toward the tip of the knife 2 to 4 times with moderate pressure. Then, pull it over the cutting edge in this same motion 4 to 6 more times, but this time with light pressure.