Genuine ECHO Speed Feed 400 2.4 mm silentwist line head.

Includes the following adapters

1 x M10 x 1.25 left hand thread

1 x 3/8-24 right hand thread

Fits

Echo GT222ES,SRM22GES,SRM236ES

SRM236TES, SRM2620ES, SRM2620TES

SRM300ES, SRM300TES, SRM335ES, SRM335TES

SRM3020TES

WILL ALSO FIT SOME SHINDAIWA MODELS