The Genuine BMW Finisher Window Frame B-Pillar Rr Door (Black) - 51357179410 is a replacement part for the rear door of a BMW vehicle. It is designed to cover and protect the window frame on the B-pillar of the car, providing a clean and finished look. This product is made by BMW and is specifically designed to fit and function with their vehicles. It is made of high-quality materials and is finished in black to match the original design of the car. This product does not include any additional features or components and is solely intended to be used as a replacement part.