A knife sharpener is a device used to keep knives sharp. The two slots on a knife sharpener are for different types of blades.
One slot is for a coarse blade and the other slot is for a fine blade.
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The coarse blade slot is for sharpening a dull blade. It can also be used to repair a damaged blade.
The fine blade slot is for honing a blade. It puts a finer edge on the blade and makes it smoother.
The two slots on a knife sharpener are different because each type of blade needs to be sharpened in a different way. A dull blade needs to besharpened with a coarse blade to remove the dullness.
A damaged blade needs to be repaired with a coarse blade. A fine blade just needs to be honed with a fineblade to make it smoother.
