The STIHL 40027109601 is a genuine OEM upper gear housing designed for a range of STIHL trimmers and brushcutters. This essential component ensures the proper functioning and protection of the internal gear mechanisms. It is compatible with models such as the FS 38, FS 40, FS 45, FS 46, FS 50, FSE 60, FSE 71, FSE 81, FSA 60 R, and FSA 86 R, providing a precise fit and reliable performance for maintaining your STIHL equipment. With a weight of 0.12 kg and dimensions of 95 mm length, 51 mm width, and 51 mm height, this part offers a direct replacement for the original component.