The Genuine BMW Window Regulator Kit (part number 51331977580KT) is a high-quality replacement kit for a faulty or damaged window regulator in BMW vehicles. This kit includes all necessary components for a complete and proper installation, including the regulator itself, mounting hardware, and electrical components. The window regulator is responsible for controlling the movement of the window glass, allowing it to smoothly open and close. This kit is specifically designed for use in BMW vehicles and is made with genuine BMW parts for optimal performance and longevity. It is an essential component for maintaining the functionality of the windows in your BMW.