Saw files (also known as sharpening files) are primarily designed for sharpening bladed metal tools.
The majority of saw files are triangular or diamond-shaped, as they have been designed to fit between the teeth of a saw.
Those files that are different will have been developed to sharpen specific tools, such as chainsaws. These tools may be circular, rectangular or square.
Saw files are always American pattern.
They are most often single cut, as double cut files would result in an irregular edge when sharpening, thanks to their diamond-shaped teeth.
Examples of saw files include taper saw files, which are used for sharpening hand saws, and chainsaw files.