Has foldable handles means that you can sharpen your knife without risking cutting yourself.The diamond sharpener is the absolutely best tool for standard knife sharpening. Even if a diamond whetstone gets worn, it remains flat and that is a great advantage in the long run when sharpening knives. In addition, the diamond whetstones are fast in their action, you get a new edge very fast. No oil or water is needed either.
The yellow surface consists of titanium aluminum nitride which greatly prolongs the life of the sharpener. You use the rough side (44 microns) if you have received a real edge damage, the fine side (25 microns) for normal edge sharpening. The whetstone comes with an instruction in English on how to use it. For cleaning, use some washing-up liquid and hot water. Like all diamond sharpeners, this whetstone is a bit rough at first but gets smoother after a period of use.
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