PROPRIETARY TUNGSTEN CARBIDE SHARPENER MADE IN AUSTRIA AUTOMATICALLY ADJUSTS TO BLADE ANGLE (12-20 DEG). This ultra-hard tungsten carbide sharpener will cut a bevel at any angle you choose . Pull the tip down to cut a factory bevel, the tip up to smooth and align the edge without stripping the metal. Press lightly for a thin blade to slice the blade. Press harder for a solid chopping blade. Triple action sharpeners keep knives sharp without removing metal. Sharpen, realign and polish simply by changing the angle of the knife. Professionals use a chef's steel to realign and maintain a sharp edge, but this skill takes a lot of practice. Get the same results even faster with these triple action sharpeners. The smooth edge presses the edge of the knife into alignment at just the right angle. Also works on straight and serrated blades to maintain sharpness. SAFE TO USE WITH THE BEST KNIVES. Realign the edges before they roll and dull. Polish a micro-bevel on the finest cutlery without fear