1. Compatible Design: This flexible drive shaft is specifically crafted to work with multiple trimmer models including FS38, FS46, FS40, FS50, FS55, FS55R, FS75, and FS85, allowing you to maintain your existing equipment without a completely unit. 2. Construction: Made from robust materials measuring 57 inches (144.8 centimeters) in length, this shaft core is built to withstand outdoor conditions and regular use, providing reliable performance for all your landscaping and garden maintenance tasks. 3. Easy Installation: The straightforward replacement process requires minimal tools and technical knowledge, making it simple for homeowners and professionals alike to quickly restore their trimmer's functionality and get back to work. 4. Enhanced Performance: By replacing your worn or damaged shaft with this compatible part (4130 711 3210), you'll experience smoother operation, improved power transfer, and more efficient cutting action for better overall trimmer performance.