The TRW Control Arm Kit 4-Piece - 138115 is a comprehensive set of products designed for use in a car's suspension system. It includes four control arms, which are vital components that connect the wheels to the chassis of the car and allow for smooth and stable movement. The kit also includes a variety of other necessary parts, such as bushings, bolts, and nuts, to ensure proper installation and functioning of the control arms. These products are essential for maintaining the stability and safety of a car's suspension, as well as improving overall handling and performance. This kit is suitable for various makes and models of cars and is a convenient and cost-effective solution for replacing worn or damaged control arms.