Echo 99944200047 3-Tooth Grass & Weed Blade (20mm Arbor) Genuine OEM Echo Part 10" Blade .8" Arbor (20mm) For use on all ECHO straight shaft SRM series trimmers and brushcutters (Blade conversion kit required if not supplied with your original trimmer) Cuts through heavy overgrown grass, Great for tough grasses where a string head just won't cut it, Use on tough tall grasses Features 3 blades for an aggressive cutting surface