When sharpened regularly, top-quality knives chop and dice more efficiently and will last longer. This three-stage sharpener gives both straight-edged and serrated knives a finely honed edge in seconds using 100% diamond-coated disks. Three-stage process sharpens, hones and strops straight-edged or serrated blades. Patented springs hold knives in angled slots for accurate control. First two stages sharpen and hone using 100% diamond-coated abrasive disks. Final stage uses flexible stropping disks for a finished polish. Guaranteed not to destroy the temper of fine kitchen blades.