The authentic STIHL 41406400110 Gearhead is a genuine OEM replacement part designed for optimal performance and durability in compatible STIHL outdoor power equipment. This essential component ensures precise power transmission and reliable operation for a wide range of STIHL trimmers, brushcutters, and KombiEngines, including models like the FS 38, FS 45, KM 55, and KMA 135. Constructed to STIHL's rigorous quality standards, this gearhead provides a perfect fit and restores your equipment's efficiency.