Which shape of file is most suitable for finishing bottom slots?

The square file is particularly suitable for finishing bottom slots because its shape allows for effective filing in corners and flat surfaces, which is essential for achieving a smooth finish in slot-type geometries. The four flat sides of a square file enable users to reach and refine the edges of the slots while maintaining consistent depth and width. This makes it ideal for applications where precision in the dimensions of slots is important, such as in aviation structural work.

Additionally, since the square file can easily create or refine right angles at the bottom of slots, it proves invaluable in situations where a tight fit or exact specifications are required. This characteristic ensures that when finishing these slots, the desired shape and dimensions are maintained without damaging the surrounding material.