Which characteristic best describes a Barrette file used in fitting work?
It has a flat triangular face with teeth only on the wide surface
A file is classified by its cross-sectional shape, and the shape decides where the teeth are cut and what work the file can reach.
A barrette file has a flat, roughly triangular cross-section in which one broad face carries teeth while the back and the narrow edges are left smooth (safe).
Because only the single wide surface cuts, a barrette file can work flat against one surface without touching an adjacent face, making it ideal for finishing sharp internal corners and flat bottoms.
The other descriptions belong to different files: round teeth on all sides describe a round file for enlarging holes, and square rough faces describe a square file for keyways.
Hence, the answer is It has a flat triangular face with teeth only on the wide surface.
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The file used for filling leather is
