The new Speed-Feed 400 trimmer head replaces the popular Speed-Feed 375 model with numerous upgrades and improvements. While it retains the fast & easy loading technique (loads in 30 seconds or less with no diassembly!), it also boasts a 65% larger capacity, holding up to 20′ of .095″ trimmer line. Additional upgrades include a 78% thicker bottom cover & round eyelets for increased durability. This head fits most premium trimmer brands including Echo, Honda, Husqvarna, Maruyama, RedMax, Shindaiwa, Stihl (does not fit Stihl curved shaft trimmers). Fits both straight and curved shaft models with included adapters.