This is a decent knife honing machine sold at a great price. If you don't understand what sharpening is or how to do it, Elton Brown has a very good YouTube video called Avoidance Training Video. Basically, he passes the blade over the grinding surface 5 times on one side, 4 times on the other side, 3 times on the original side, 2 times on the opposite side, and then once on the original side. As another reviewer mentioned, this item is made in China, not Germany. As you can see in my photo the plastic is slightly different to the other Henckel brand knives in my block which may or may not be an issue for you.
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