The STIHL 63017008518 is a genuine OEM protection housing designed for various STIHL FSA series cordless trimmers and brushcutters. This essential component helps to shield the user from debris and the cutting line during operation, ensuring safety and optimal performance. It is compatible with STIHL FSA 90, FSA 90 R, FSA 130, FSA 130 R, FSA 135, and FSA 135 R models, providing a direct fit replacement for damaged or worn original housings.