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Files are the tool of choice to make adjustments when a previous cut didn't come out just right. They can also be used to round edges, open holes, or just to remove a little unnecessary material. A fine file set is required for most scratchbuilding and kitbashing adventures.

Sometimes larger files are required, usually these two will do. The flat file is called a mill file and is most useful for removing protrusions from otherwise flat surfaces or edges. The round file is useful for enlarging holes or converting a drilled hole into a slot.