The King Shocks 3.0-inch ID coil spring listed as 12 x 150lb is a moderate-rate, longer-length spring intended for suspension assemblies that accept a 3.0-inch inner diameter. Compatible with matching shock bodies, it’s suitable for replacement or custom setups where a 150lb rate and extended length help balance ride comfort with adequate load handling.
King Shocks 3.0 ID Coil Springs 12 x 150lb