The DT Swiss Ratchet System Freehub Body with HD Driver is a high-performance upgrade designed for compatibility with mid-range DT Swiss hubs such as the 350 series. Engineered with a durable aluminum construction and finished in a sleek gloss, this freehub body supports SRAM XD cassettes and is optimized for rear hubs with 142mm spacing and 12mm thru-axles. Unlike traditional designs, the freehub body itself does not include a seal—this function is integrated into the hub shell for a simplified, efficient system. As the original ratchet-driven mechanism from DT Swiss, it delivers reliable power transfer and easy maintenance, making it a trusted choice for riders seeking proven performance and long-term dependability. End cap is included for a complete and ready-to-install solution.