Genuine OEM Volkswagen hexagon socket head bolt, part number N91120901. This high-strength bolt is designed for secure fastening within the intake and turbocharger assembly, specifically at position 24 on the diagram. It features a cylindrical head with a hexagon socket for high-torque applications. Genuine OEM fasteners are essential in high-heat and high-vibration areas like the turbo system to maintain structural integrity and prevent leaks.