teeth of a rasp; file teeth
Refers to the individual cutting teeth on a rasp or file.
This file has fine teeth, so it's suitable for finishing work.
rasped area; filed surface
Refers to the area or surface that has been rasped or filed.
To smooth the filed area of the metal, I used an even finer file.
Common mixed kana-kanji spelling; clear and easy to read.
Kanji spelling using the rare character 鑢 for 'file/rasp'; mostly seen in technical or older texts.
Katakana spelling for やすり; sometimes used for emphasis or in technical contexts.
Compound of やすり (rasp/file) and 目 (eye, here meaning 'pattern' or 'texture'). The exact origin of やすり is uncertain, but it may be related to the verb やする (to smooth).