Just FYI
my stash of files in my drawer.
1. My go to Tamiya basic set. Good teeth and a nice kinda smooth finish.
2. Cheap set of many mini, various shapes come in handy.
3. large set, there are more, rough and cut deep.
4. Itty bitty diamond rounds at bottom, at top a bit larger round, square, flat, half round and three sided. The rounds are 1mm smallest!!!!
5. Biggass from random places, flee markets, my garage. Second from right is very flat as and I used it to flatten wing and fuselage halves, often called "lapping" for mating surfaces. Less gap filling.
6. And, of course you do need a file card for cleaning the teeth!!!!!!