The URO Parts Coil Spring Insulator - 011186 is a rubber or plastic component that is placed between the coil spring and the vehicle's suspension system. Its purpose is to cushion and absorb shocks and vibrations from the road, preventing them from being transferred directly to the vehicle's body. This helps to improve ride comfort and reduce noise levels. The insulator also helps to extend the life of the coil spring by reducing wear and tear. It is designed to fit specific make and model vehicles and is a direct replacement for the original part.