rat-tail file

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Noun1.rat-tail file - a thin round file shaped like the tail of a rat
file - a steel hand tool with small sharp teeth on some or all of its surfaces; used for smoothing wood or metal
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References in periodicals archive ?
With rat-tail files and sandpaper, clean shavings from in and around the holes.
* Using rat-tail files, carefully enlarge both holes as necessary while retaining their circular shape to accommodate the handle.