How to Use a Rasp

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.