The Chef's Choice Pronto 464 manual Diamond Hone sharpener is an easy-to-use tool for quick sharpening. You can use it on any European-style kitchen knife or sporting knife with a 20 degree blade angle. The first stage can sharpen even the hardest steel blades with its coarse diamond abrasives. The second stage uses is great for honing and polishing your blades' edges with its finer abrasives.