What is a common use for a round file?

A round file, also known as a rat-tail file, is primarily utilized for enlarging round holes. Its tapered design allows for precise removal of material in circular patterns, making it ideal for tasks where holes need to be made larger or smoothed out. The round cross-section allows the user to reach into confined spaces and work on curves effectively.

In the context of aviation and structural maintenance, round files are essential for achieving proper tolerances and ensuring that components fit together correctly, especially in instances where modifications to circular openings are required. This capability is critical for the integrity and safety of structures and systems in aviation.

While finishing edges, creating sharp angles, and polishing surfaces are important tasks that may require different types of files or tools, they do not leverage the unique characteristics of the round file in the same way enlarging round holes does.