PROPRIETARY TUNGSTEN CARBIDE SHARPENERS MADE IN AUSTRIA AUTO-ADJUST TO BLADE ANGLE (12-20 DEG). This ultra-hard tungsten carbide sharpener will cut a bevel at the angle of your choice. Pull through tip down to cut a factory bevel, tip up to smooth and align the edge without removing metal. Press lightly for a fine blade for slicing blade. Press harder for a sturdy chopping blade.TRIPLE-ACTION SHARPENERS KEEP KNIVES SHARP WITHOUT REMOVING METAL. Sharpen, re-align and polish just by changing angle of the knife. Professionals use a chef?s steel to realign and maintain a sharp cutting edge, but this skill takes much practice. Get the same results even faster with these triple-action sharpeners. The smooth edge presses the knife edge into alignment at just the right angle. Works equally on straight and serrated blades to maintain sharpness.SAFE TO USE WITH THE FINEST KNIVES. Re-align edges before they roll over and dull. Polish a micro-bevel on the finest cutlery without fear of damaging blades. These two steps will keep knives razor sharp without removing any metal. Great for Japanese or Damascus knives, or any knife at all. Directions printed on bottom.