Gerber Ceramic Pocket Sharpener
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This is the simplest way to keep a razor-sharp edge on all your blades. Small and light enough to take backpacking, you can stash one of these everywhere to keep all of your tools in top condition. It works by having sets of 2 specially spaces ceramic rods for foolproof sharpening. Comes with fine and coarse rods for softer or more aggressive grinds. Works on everything from diamond to stone to ceramic to steel.