Grass Gator 12200 Chrome Dome Commercial Head Bump & Feed Fits 99 percent of all straight shaft gas trimmers This is a bump and feed head that really works, and the metal bump knob provides excellent durability The grass gator chrome dome is excellent for both grass and weeds It can handle .095 to .105 diameter line, which gives you more versatility in the choice of trimmer lines to use Easy to install, without tools, and is easy to use