Used correctly, this diamond chainsaw file will last a long time and increase the life of a chainsaw blade. Often only one or two light strokes are sufficient to put a sharp edge back on the blade. Blue Coarse Grit. Size 5.5mm https://elecena.pl/product/27256021/dmt-fcs7c-diamond-chainsaw-file-5-5mm-blue 2024-11-13 https://elecena.pl/product/27256021/dmt-fcs7c-diamond-chainsaw-file-5-5mm-blue 2025-10-13