INOVERA (LABEL) 3 Slot Kitchen Knife Sharpener Tool, Black # Description #  The first section is a diamond coarse slot which sharpens and straightens the damaged blades. The second slot restores its V-shape and the third slot polishes to provide a fine finish. With our chef's garage knife sharpeners, chopping and slicing become a less troublesome task. If you want to save up time and chop the vegetables as smooth as butter then you surely need a great knife sharpener. This sharpener is perfect for sharpening the metal blades but it is not suitable for serrated and ceramic blades