With the Chef's Choice Electric Knife Sharpener CC220, all your kitchen knives will stay effortlessly razor-sharp. It is a pull-through sharpener, which means that you pull the knives through the sharpener manually. There are 2 different phases. The first phase you use to sharpen your knives at the right angle. The second phase is for polishing the blade. The electric knife sharpener is suitable for sharpening all smooth and serrated blades with a European sharpening angle.