A round file 4.8 mm in diameter for sharpening the teeth of a chainsaw chain. The brand "STIHL" is given in the name. Choose the file diameter to suit the chain pitch.
Sharpen the chain when the saw pulls to one side, the chips become fine, and you have to press hard while cutting. The file diameter must match the chain pitch.
Good preventive care: regularly clean the saw of sawdust and resin, use fresh fuel mixture and chain oil suited to the season.
