Genuine OEM Volkswagen Bolt With Washer, part number N91121903. This fastener features an integrated washer that provides a larger bearing surface, effectively distributing clamping force and protecting the surface of the component being secured. It is designed for use in engine cooling assemblies where a secure, leak-free connection is required. Genuine OEM bolts are manufactured to precise metallurgical standards to ensure they can withstand the thermal cycling and vibration inherent in engine cooling systems without failing.