What kind of file should be used to file chain saw?

Section 3 / 8 chain with 4.0mm file
Chain with pitch of 0.325; 0.058 chain saw
Equipped with 4.8mm file
Large pitch 3/8 chain; 0.050 and 0.063 chains are equipped with 5 5mm file
It can also be divided in this way. For medium-sized machines, use 4.8 round file, electric saw and small chain saw use 4.0 file, and large chain saw use 5.5 file. After use, the file must be cleaned to avoid rust