INCLUDES 7 ABRASIVES: The seven abrasive grits (220, 320, 400, 600, and 800) diamond, fine ceramic, and leather strop allow you to cater to what your knives or tools need and what will suit them best. ADJUSTABLE, REPEATABLE, CUSTOM: The sharpening angle can be easily adjusted from 15-30 degrees, and you can choose between many grit options to reprofile an old blade or create a beautifully polished edge to your favorite, including serrated knives. FAST & EASY: Quickly index between grits on each Tri-Brasive sharpening stone and easily swap one rod with another without disrupting your work.