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No-guess sharpening! Blade selector adjusts the guides to the perfect angle needed for precision sharpening. Select thick for hunting knives, medium for chef's knives and standard kitchen knives, and thin for light blades like fillet and paring knives. Simply draw the knife through each slot a few times to achieve a razor-sharp edge. STAGE 1-begins the sharpening process with a Sapphirite coarse-grinding wheel to create the proper angle. STAGE 2-continues sharpening with a Sapphirite medium-grinding wheel giving the blade a precision edge. STAGE 3-completes the process with an extra-fine grit ceramic wheel polishing the blade to an exact, razor-sharp edge.