The 'Bolt Dr. Flange Trans. M10' for a Citroën 11CV is a specific fastening bolt designed for the drive flange of the transmission. The bolt features an M10 diameter, typically indicating 10 millimeters thickness. In vehicle repairs, using the correct bolts is crucial for safe and proper assembly, especially with critical parts such as the transmission. This bolt is specifically made for the Citroën 11CV, a classic model, ensuring secure and safe mounting in the vehicle's drive system, which is essential for optimal performance and reliability of the classic car.