AnySharp Knife Sharpener uses tungsten carbide technology to extend the life of almost any knife. AnySharp works on virtually any steel knife, including expensive hardened steel knives and even serrated blades, making it unlike any knife sharpener, sharpening steel or sharpening stone you’ve ever used. AnySharp unique safety feature is its PowerGrip suction cup base, which attaches securely to any smooth surface or worktop without the need for any tools. AnySharp has a long-lasting polymer guiding top that is softer than metal, and therefore won’t damage the metal edge, making it safe for your knives too. AnySharp will hone it to a perfect angle, and remove excess metal rapidly the first time you use it. Once sharp, better results are gained by using only light pressure, and only microscopic amounts of metal are shed.