Genuine OEM Volkswagen Hexagon Collar Nut, part number WHT009837. This nut has a hexagonal head and an integrated collar, which provides a larger bearing surface for secure fastening. It is identified as item 20 in the diagram. The nut measures 0.053m in length and width, and 0.025m in height. Genuine OEM nuts are manufactured to precise specifications, ensuring proper thread engagement and load-bearing capacity for safety and longevity.