The 463 manual Asian knife sharpener from Chef's Choice applies perfect and durable 15 degree edges within seconds! It is the fastest manual Santoku and 15 degree style sharper available. The knife sharpener has 2 stages, sharpening and honing/polishing, for an arch shaped edge. The 463 sharpener has 100% diamond abrasives in both stages and features Chef's Choice's Criss-Cross sharpening technology for sharp edges that you will love. The Asian knife sharpener can be used for both serrated and straight edge knives and sharpens chef's, santoku, bread, hunting, fillet, and pocked knives.