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How to use a knife sharpener
Examine the knife sharpener.
There are multiple types of manual knife sharpeners. Some only have one slot, while others may have two or three.
Each slot should have two steel, ceramic, or diamond-coated disks on either side, and these disks are what sharpen the blade of the knife. Simple knife sharpeners only have on sharpening slot, but others have two or three.