Replaces speed feed 400 trimmer head and fits most Echo, Honda, Husqvarna, Maruyama, RedMax, Shindaiwa, Stihl string trimmers. Trimmer Head Diameter: 3-3/4" . M10mm x 1.25mm LH threaded. Please note it fit for all ECHO SRM straight shaft trimmers, NOT for Curved Shaft Trimmer.
Replaces OE # 78890-18000, 78890-18001, 78890-11000, 78890-30000 Trimmer Head ( (For Echo, You may need to order Shield p/n C550000032) and 78890-18000.
Fit most 78890-11000 Speed Feed 375 Head,78890-30000 Speed Feed 400 Head,78890-30000B Speed Feed 400 Head.