Sharpening serrated knives is easy with the DMT serrated knife sharpener! The DMT® Diamond Serrated Knife Sharpener makes quick work of this job by allowing you to sharpen the gullets of your serrated knives. The conical shape of the diamond surface makes it easy to sharpen different sizes of knife serrations.DMT recommends fine grit for sharpening most serrated kitchen knives. It sharpens fast and leaves a good cutting edge. After sharpening, your serrated knives will have more "bite" and will cut through foods more effectively. Made in the USA.