Which application is most suitable for a triangular file?
Sharpening saw teeth
A triangular (three-square) file has three flat faces meeting at 60-degree edges, giving it sharp corners that can reach into acute angles.
The teeth between saw-blade teeth form a 60-degree V, so the triangular file matches that shape exactly and is used to restore the cutting edges when sharpening saw teeth.
Polishing, boring, and thread cutting are done with other tools, not a triangular file.
Hence, the most suitable application is sharpening saw teeth.
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The file used for filling leather is
