One of the toughest parts of sharpening your own knives is getting the angle right so you are in fact “sharpening” it. The Angle Set Knife Sharpener eliminates the guesswork & the potential damage to your blades. The self-contained unit unfolds to reveal an A-frame consisting of adjustable 3-sided hones. They utilize magnets to keep your blade perfectly positioned while sharpening, so you can’t screw it up. As the blade gets sharper, simply adjust to use the finer hones.