Replacement Trimmer Head for the Stihl Auto Cut 25-2, Fits: FS44, FS55, FS80, FS83, FS85, FS90, FS100, FS100RX, KM55, KM85, KM90, KM110, KM130. Uses: for mowing grass around trees, between bushes, along borders, walls and fences. No moving parts - no risk of error when replacing the trimmer line. Dual spool - reduces the risk of welding the trimmer line. (Stihl 4002-710-2108 AutoCut Trimmer Head) Notched eyelets - easy to replace trimmer line. Maximum permitted number of revolutions: 10,000 rpm