A set of twelve files for sharpening the teeth of a saw chain. The diameter is not stated in the name; choose it by the chain pitch.
Sharpen the chain when the saw starts to "drift", the chips become fine, and you have to press hard while cutting. The large set is convenient for professional and frequent use.
It is best to do the work on a cooled engine with the ignition off, and to tighten the fasteners without overtightening, so as not to strip the thread in the body.
