The TRW 4-Piece Control Arm Kit (1M M3) - 462348 is a comprehensive kit designed for servicing a car's control arm system. It includes four essential components that are necessary for maintaining and repairing the control arm system of a car. The kit contains four control arms, which are crucial for supporting the weight of the vehicle and allowing for smooth steering and suspension movement. It also includes four ball joints, which connect the control arms to the steering knuckles and allow for flexibility in movement. The kit also contains four bushings, which are used to reduce friction and absorb shock in the control arm system. Lastly, the kit includes four mounting bolts, which are necessary for securely attaching the control arms to the car's frame. This 4-piece kit is a convenient and comprehensive solution for ensuring the proper functioning of a car's control arm system.