Replacement OEM Part Number：25-2 weed eater head exact replaces 4002 710 2191, 4002 710 2108, 4002 710 2168 Fits: Compatible with S tihl FS44, FS55, FS55R, FS56 (2008 On), FS56RC, FS70, FS70R, FS74, FS76, FS80 (1996 On), FS80R, FS83, FS85, FS85R, FS87, FS87R, FS90 (2005 On), FS90R, FS91, FS91R, FS94, FS94R, FS100, FS100RX, FS110, FS111RX, FS120, FS130, FS130R, FS131, FS131R, FS200 (1997 On), FS240, FS250, FS260R, FS460R (2011 On) Fits: Compatible with S tihl FR85, FR85T, FR106, FR108, FR130T, FR220, FR350, FR410, FR450, FR460, FR480, FSA90R, FSA130R, FSA135, FSA135R, KM55, KM55R, KM56, KM56R, KM85, KM85R, KM90, KM90R, KM94, KM100, KM100R, KM110, KM110R, KM120, KM130, KM130R, KA85, KA85R, KR85, FS-KM Package Includes: 2 pack 25-2 trimmer heads.Bore thread diameter: 10mm x 1.0 LHF Replaceable with 25-2 trimmer head Pleases make sure the part number of new replacement matches your original equipment before ordering. If you encounter any problem, feel free to email us. We will be more than happy to respond ASAP(within 24 hours) Replaces Number: 4002 710 2191, 4002 710 2108, 4002 710 2168, 25-2. Fits for S tihl FS44, FS55, FS55R, FS56 (2008 On), FS56RC, FS70, FS70R, FS74, FS76, FS80 (1996 On), FS80R, FS83, FS85, FS85R, FS87, FS87R, FS90 (2005 On), FS90R, FS91, FS91R, FS94, FS94R, FS100, FS100RX, FS110, FS111RX, FS120, FS130, FS130R, FS131, FS131R, FS200 (1997 On), FS240, FS250, FS260R, FS460R (2011 On). Fits for Stihl FR85, FR85T, FR106, FR108, FR130T, FR220, FR350, FR410, FR450, FR460, FR480, FSA90R, FSA130R, FSA135, FSA135R, KM55, KM55R, KM56, KM56R, KM85, KM85R, KM90, KM90R, KM94, KM100, KM100R, KM110, KM110R, KM120, KM130, KM130R, KA85, KA85R, KR85, FS-KM