Genuine OEM Volkswagen Speed Nut, part number N91038401. This fastener grips a bolt or screw by its threads, often used in applications where quick assembly is required. Located at position 21 in the diagram. This part is a type of fastener that grips a bolt or screw by its threads, often used in applications where quick assembly is required. Genuine OEM fasteners ensure precise fitment and reliable performance, preventing premature wear or failure.