Which file is appropriate for filing saws?

A triangular file is specifically designed for filing saws because its shape allows it to effectively reach the unique angles and points found in the teeth of saw blades. Saw teeth are typically shaped in a way that requires a precise filing technique to maintain their sharpness and cutting ability. The pointed edges of a triangular file can easily fit into the gaps between the saw teeth, ensuring that each tooth can be sharpened accurately.

Flat files, while versatile, are not as effective for this purpose since their shape does not allow for the detailed work needed on the angles of saw teeth. Round files are useful for enlarging holes or curves but lack the sharp points necessary for the intricate filing of saw teeth. Half-round files may provide some versatility, but they still don’t match the triangular file's ability to get into tight spaces between the teeth of a saw.

The triangular file's design optimally matches the requirements of maintaining the performance of saw blades, making it the most appropriate choice.