3x4mm fit for Woodwork Round Chainsaw Sharpening Files Sharpener 3/8'' Chain pj
(3PCS 4mm Round Chainsaw Saw Sharpening Files Sharpener 3/8" Chain for Woodwork. Item included: 3 x saw chain files. 2) Start filing by tightening the tension on chain to firmly support cutters and file from inside to outside of cutter.