Return dull knives to fresh-from-the-factory condition with this Work Sharp® Angle Set Manual Knife Sharpener. Tri-Brasive 3-sided sharpening surface gives you coarse, medium and fine grit all in one tool. Starting with a damaged or dull edge, you can visit each side in turn before stopping at the fine-grit ceramic stone for an incredibly keen finished product. No water or oil required. Folds up in the built-in travel case for easily taking your sharpening show on the road.