Professional 3-stage sharpener for super sharp edges on your 15 and 20-degree class knives 100 percent diamond abrasives are used in all three stages. The initial stages sharpen and hone using 100 percent diamond abrasives while the third stage polishes the edge with micron sized diamond abrasives Sharpen straight edge and serrated knives as well as sports and pockets knives Chef’sChoice advanced CrissCross sharpening technology delivers an extremely sharp edge by using diamond abrasive wheels w