Files 4.0 mm in diameter for sharpening the teeth of a saw chain, 3 pcs per pack. Manufacturer: OREGON. The diameter is chosen to suit the chain pitch, which is stated in the chain's marking. Manufacturer: OREGON.
Sharpen the chain when the saw starts to "drift" to one side, the chips become fine, and you have to press hard while cutting. Sharpen at a consistent angle and hold the file at the diameter of the tooth.
