round file is a type of file which is used to de-bur and smooth
down round or oval holes in metalwork. Round files can also be used
to smooth tight curves in cut metalwork where a flat-file or half
round file cannot reach.
Round files come in a wide variety of sizes to suit different jobs,
however they also tend to have a tapered shaft so they can smooth
a variety of sizes - within a certain range.
Round files can have either plastic or wooden handles. To keep the
file in good condition it should be regularly sharpened and cleaned.