A tool that will benefit every type of knife owner, the CRKT Keychain Sharpener ($12) has been constructed from the highest quality material for long lasting results. Fixing to your keys, this compact machine features a CRKT micro tool with knife sharpener that can be used anywhere to ensure the smoothest of cuts. Alongside the sharpening function, this company key chain also boasts a flat head screwdriver, channel blade/cutter and a bottle opener making it a highly practical choice for all manner of different tasks. Easily attached with a split-ring, this high-quality tool offers the modern man a small selection of his most essential tools.