Universal 3.0" ID 14 x 550lb Coil Springs (KINSPR3-14-550)King 3. 0" coil springs are precision wound in the USA from high tensile chrome silicon wire to deliver strong, consistent suspension support for demanding off road applications. Designed to pair with 3. 0" diameter shock bodies, these springs provide dependable spring rates and improved control over rugged terrain. Developed through extensive real world testing, they are built to withstand tough conditions and deliver long lasting performance.