Effortlessly sharpen Japanese sharpened blades with a smooth or serrated cut. This knife sharpener has 2 phases; 1 for sharpening your knives and 1 for polishing. You also use the knife sharpener for daily maintenance. The knife sharpener is especially for Japanese knives. As a result, you always sharpen the correct sharpening angle of 15 degrees. With patented precision guides made of 100% diamond, grinding is simple and safe, and you always have razor-sharp knives.