Molded composite LEFT steering block for 4mm King Pin. Complex material. Marked "L" for easy identification. Composite steering block is redesigned to utilize the 4mm master pin axle, features redesigned Ackerman jobs for improved steering, and is molded from a unique graphite composite item for minimal friction unlike the kingpin. The steering obstructs utilize ultra-precise wheel axles CNC-machined from premium HUDY Spring Steelââ? which are in addition hardened and hand ground for precision fitment. Usage with matching right steering block #372214.