Genuine OEM Volkswagen Rear Axle Differential Adjustment Disc, part number 2D0525291AT. This precision component is used to accurately adjust the internal clearances and backlash within the rear axle differential assembly. It is positioned alongside bearings and gears inside the differential housing. Weighing 0.065 kg and with a thickness of approximately 0.005m, this disc is crucial for proper gear mesh. Using a genuine OEM adjustment disc ensures the correct dimensions and material hardness, which are vital for achieving precise tolerances, minimizing wear, reducing noise, and extending the service life of the differential.