Genuine OEM Land Rover Washer, part number JYF100190. This flat metal ring is designed to be placed under a fastener's head or nut to distribute the load over a larger area, preventing damage to the surface and ensuring a secure connection. It can also be used to prevent leakage or as a spacer. Genuine Land Rover washers are made from high-quality materials to ensure durability and corrosion resistance, providing reliable performance.