Universal 3.0" ID Coil Springs 14 x 350lb (KINSPR3-14-350)King 3. 0" coil springs are precision wound in the USA from high tensile chrome silicon wire to deliver durable performance and consistent suspension support in off road conditions. Designed for use with 3. 0" diameter shock bodies, these springs provide reliable spring rates and improved control over rugged terrain. Developed and validated through extensive real world testing, they offer lasting strength and performance where it matters most.