The Genuine BMW Tie Down Hook Cap (part number 51477464192) is a small plastic cover that fits over the tie down hook on select BMW vehicles. This cap helps to protect the tie down hook from dirt, debris, and damage, and also provides a more finished and sleek appearance. It is a genuine BMW product, meaning it is made by the original manufacturer and is designed specifically for BMW vehicles. This tie down hook cap is a simple and affordable way to enhance the look and functionality of your BMW.