Echo 99944200220 Heavy Duty Fixed Line Aluminum Trimmer Head Genuine OEM Echo Part Very heavy duty trimmer head - cast aluminum body - string is fixed, replaced manually Typically only used on heavier duty brush cutter systems of 30cc or better to handle the mass of this head Fits many makes and models where steel weed and brush blades may be used, but specifically engineered for Echo power equipment Fits: SRM-225, SRM-225i, SRM-225U, SRM-230, SRM-230S, SRM-230U, SRM-251, SRM-265, SRM-265S, SRM-265U, SRM-266, SRM-266S, SRM-266U, SRM-280, SRM-280S, SRM-280U, SRM-410U