Genuine OEM Volkswagen Adjusting Washer, part number 02D409247. This washer is used for fine-tuning clearances and ensuring proper alignment within the differential assembly. It is critical for achieving the correct gear mesh and reducing wear. Located within the drivetrain, specifically in the differential. Manufactured from hardened steel for durability and precise dimensions. Genuine OEM adjusting washers are manufactured to exact tolerances to ensure the correct preload and backlash in the differential, contributing to a long service life and quiet operation.