Smiths Products 50264: The Adjustable Angle Pull-Thru Knife Sharpener has two stages of sharpening for all types of straight edge knives with a grind on both sides of the blade and a fixed-angle slot for sharpening serrated edge blades. It will sharpen a wide variety of knives by simply adjusting the angle of the abrasive components to match the angle of the original factory grind.