250mm Half Round file with a tapered end.
Flat side: Doublecut bastard
Round side: Doublecut bastard
Video-How to use a file: https://youtu.be/1iKwP6A1Mss
Video-How to use and select files for metalworking: https://youtu.be/lOR2UwZRBws
Article-Types of Files: https://www.kmstools.com/blog/hand-file-identification/