Grass Gator 3630 Universal Bump & Feed Replacement String Trimmer Head Most straight shaft gas trimmers 27ccs or more It is not recommended for curved shafts or trimmers with fixed line heads Fixed line head trimmers require a special adapter kit that will not work with this particular model The 3630 comes pre-loaded with GrassGator .105 Shaped trimmer line but it also takes .095 or .080 Holds up to 14' of line so you can spend more time cutting and less time re-loading Can be used as a weed and grass trimmer or as an edger