Here is the ideal diamond sharpener for your tool box, tackle box, pocket or kitchen drawer. Just flip it open for a handheld sharpening station. With dual abrasive surfaces - fine grit on one side, extra-fine on the other - it will bring your tools, router bits and knives to a truly polished, razor sharp edge. The unique folding handle encases and protects the sharpening surfaces from other tools, no matter how cluttered your tool box might become. It sharpens in a fraction of the time required by conventional stones. No flattening, and no messy oils required - sharpen dry or with water.