Woniu Trimmer Head 10mm x 1.0 LHF for Stihl Autocut Go 25-2 FR106 FR108 FS44 FS55 FS80 FS130 Replace STIHL 4002 710 2191

Does not fit Stihl FS55r as the thread is too wide. This is not a knock on the seller as only FS55 not fs55r was listed as compatible, although I have no idea what the difference might be...maybe the thread width

same as OEM

Head flew apart second day of use...didn't hold up an hour of use. Should not have expected much at this price.

Broke the taps after 3 uses.