Angle constancy is the most critical and the most elusive element of hand sharpening. The Lansky Controlled-Angle System is a guided knife sharpening system that ensures that your knife edge sharpens to the exact bevel you specify. Designed to give your blade a professional, razor sharp edge every time, regardless of your sharpening ability. Excellent for beginners and advanced users alike. The original and legendary Controlled-Angle System is the ultimate in Knife Sharpening technology. Serrated Medium Hone: for sharpening serrationsCoarse Red Hone: (120 grit) for edge reconditioningMedium Green Hone: (280 grit) for sharpening and less frequent touch-upsFine Blue Hone: (600 grit) for most frequent touch-ups to keep your blade paper-slicing ÷sharpHoning Oil: Specially Formulated for sharpeningEasy to use, multi-angle clamp: to hold the blade securelyGuide Rods: One for every honeN/A