When preparing an object for filing, it should be fixed in a vise so that it cannot move.
A file is a two-handed job, so there is no way for the home craftsman to hold the workpiece in a stable position unless a vise is used.
The file block is a protective piece of material that prevents damage to the object you are filing by keeping it from coming into contact with the hard vise jaws.
Feed blocks are usually made of wood or soft metal. You can use any suitable item that was lying around in your workshop!
A thick cloth can be used instead of a file, although this is much less effective than wood.
