This is a manufacturer replacement product. Part numbers include: C 26-2, C26-2, 4002 710 2169, 4002-710-2169, 40027102169 Thread Size: M10x1.25 Left Hand Compatible with Models including: Stihl FR130, FR131, FR410, FR460, FSA90, FSA130, FSA130R, S100RX, FS-KM Weed Eater Compatible with: Stihl FS55, FS55R, FS56, FS56RC, FS70, FS70R, FS80, FS85, FS87, FS89, FS89R, FS90, FS90R, FS91, FS91R, FS94, FS94R, FS100RX, FS110, FS111, FS111R, FS111RX, FS120, FS130, FS130R, FS131, FS131R, FS200, FS240, FS240R, FS250, FS260R, FS460R Weed Eater Description: This is a manufacturer's replacement product. Parts may differ in appearance but are functionally equivalent to the previous part. Trimmer Head Application: weed eater head Replaces of maintenance C 26-2 C26-2 Trimmer Head for Stihl FS55 FS56 FS70 FS80 FS85 FS87 FS89 FS90 FS91 FS94 FS110 FS111 FS120 FS130 FS131 FS200 FS240 FS260 Weed Eater String Trimmer Replaces 4002 710 2169