Genuine OEM Volkswagen Transmission Synchronizer Key, part number 0B7311241D. This small, precision-engineered metal component is an essential part of the transmission's synchronizer assembly. Its function is to engage with the synchronizer ring and gear, facilitating the synchronization of gear speeds for smooth and effortless shifting. Located within the gearbox, it plays a critical role in manual transmission operation. Using a genuine OEM synchronizer key ensures the correct material hardness, precise dimensions, and optimal engagement for reliable and long-lasting transmission performance.