Wusthof 3-stage PEtec Electric Knife Sharpener (Black & Stainless Steel) Beautiful black and stainless steel housing; Made in USA by Chef's Choice 3-stage electric knife sharpener designed to sharpen, hone and polish straight and serrated edge blades to a 14 degree edge Stage 1 slot features a diamond abrasive wheel, sharpens dull knives and creates a new edge onto the knife blade Stage 2 slot features a finer grit diamond wheel, refining the edge and hones Stage 3 has an advanced flexible stropping material to polish the knife blade to a razor-sharp edge; perfect for honing serrated blades