The Genuine BMW 18-Piece Control Arm Kit is a comprehensive set of products designed for the E39 525i and 530i models. It includes 18 essential components that are necessary for the proper functioning of the control arm system in a car. The kit contains a variety of products such as bushings, bolts, nuts, and other hardware that are specifically designed to fit the E39 525i and 530i models. These components are made of high-quality materials to ensure durability and long-lasting performance. The kit is designed to provide all the necessary parts for a complete control arm replacement, making it convenient and cost-effective for car owners. With this kit, car owners can ensure that their control arm system is in top condition and maintain the performance of their vehicle.