The Jewelstik K 123 Kitchen Three Sided Diamond Knife Sharpener is UNIQUE to any sharpener on the market. We have given you three different diamond surfaces on one unit all in the palm of your hand. Now when you pick up a dull knife, all you need to do is start on the coarse side for a few strokes. Then move on to the medium side and then finish on the fine side. This process gives you a razor sharp edge in minutes. No more dull knives in your kitchen. Soon, everyone will want to borrow it.