The TriLink Chain Saw Files make it easy to keep the saw chain sharp and the saw cutting fast. These high precision spiral cut files provide outstanding sharpness and long tool life. This aggressive spiral cut tooth design enables the user to make fast, score-free sharpening of the saw chain cutters. Precision spiral cut design provides clean, fast sharpening without scoring the cutter; Hardened carbon steel construction; 3/16 in. Dia file for all .325 pitch chains, regardless of the manufacturer; Includes 2 files; Can be used to sharpen both gas and electric saws; Rust Resistant.