Chain sharpening kit 1)Chain sharpening kit with 6" flat file 2)4.0mm, 4.8mm, 5.0mm 3)CE/GS/SGS/ISO9001 chain saw ... ) We are the first factory of manufacturing guide bar, saw chain, and sprocket in China. The product line includes guide bar ... , saw chain, sprocket, rim, wrench, chain breaker, rivet spinner, and saw file, trimmer line ...