Master Mechanic, Load N Go 2 Line Trimmer Head, Loads & Reloads In Seconds With 1 Way Line Locking System Inside The Head, Wide & Smooth Eyelet Radius Reduces Line Breakage, Works With All Line Shapes & Sizes Up To .105", Universal Fit For Curved Or Straight Shaft Units, Includes Full Adaptor Kit Included, Fits All Known Brands.