The combined sharpening stone 4451 from Wüsthof features two sides with different grits: the coarse side for initial sharpening to remove imperfections, and the fine side for honing, which sharpens the blade and professionally polishes it at the end of the sharpening process. Thanks to the excellent bonding and the open-pore structure of the sharpening stone, fresh sharpening particles are continuously exposed during the sharpening process, ensuring outstanding sharpening performance.