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A rasp is a tool like a file that is used for removing waste material.
It's big  teeth make it easy to remove large amounts quickly.

You must always use a rasp in only one direction
because it will dull the teeth when drawn backward and there is no way to sharpen them*.
rasps come in many shapes and sizes
some have two sizes of teeth others have four


* As far as I know but I would be happy to find out.
Rasps can be sharpened by sending them out to a file sharpening company or at home using an acid bath. Citric acid from the grocery store will do it albeit slowly. Other acids work faster and require closer monitoring.

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