Will fit 99% of all gas trimmers, including Ryobi, John Deere, Echo, Stihl, Homelite, Bolens, Weedeater, Craftsman, Toro, Cub Cadet, Troy Bilt, Poulan, and most other makes. Is an excellent replacement for your original bump and feed trimmer head. For use on grass and weeds. Can handle .095 to .105 diameter line. Installs without tools.