Sabercut UN-57K Strike Force Cutting System for Trimmers Strike force uses 2.0 mm to 3.0 mm 12" pre-cut trimmer line Patented swivel action prevents line breakage Fits 99% of all gas trimmers, easy to install Replacement line is easy to load Fits multiple line Sizes from (.080") 2.0 mm to (.120") 3.0 mm