The nut for the rear axle torsion bush is a crucial component for the Citroën 11CV and 15CV. It plays a vital role in the vehicle's suspension by ensuring that the torsion bars are securely fastened and functional. This nut provides stability and smooth handling, contributing to the overall driving experience and safety of the vehicle. Specifically designed for these models, the nut ensures the correct fit and performance, ensuring long-lasting reliability. An essential part for the maintenance and restoration of classic Citroën vehicles.