- Compatibility : This replacement gearbox is designed specifically for a wide range of Stihl trimmers, including models FS55, FS56, FS66, FS70, FS74, FS76, FS80, FS85, FS87, FS88, FS90, FS91, FS94, FS100, FS108, FS110, FS111, FS120, FS130, FS131, FSA135, FS200, FS240, FS250, FS310, FSKM, and FSKMA. Ensure a perfect fit for optimal performance. - Replacement Part : The gearbox replaces the OEM part number 4137 640 0100, ensuring reliability and compatibility with Stihl trimmers. - What's Included : The package contains one trimmer gearbox, as depicted in the product images. - Easy Installation : Designed for straightforward installation, this gearbox allows for quick repairs, getting your trimmer back to work with minimal downtime. - Durable Construction : Made from high-quality materials, this gearbox is built to withstand the demanding conditions of outdoor use, ensuring longevity and consistent performance. - Practical Applications : Ideal for residential and professional landscapers alike, this gearbox enables efficient trimming and edging in various environments, from home gardens to commercial landscaping projects. - Before You Order : Please confirm that this gearbox is suitable for your specific Stihl model to avoid compatibility issues. This gearbox is essential for maintaining the performance of your Stihl trimmer, offering a reliable solution for any replacement needs. Experience efficient cutting performance and durability with this quality component.