Features: 1) Designed to meet rigid tolerances and to fit and replace a wide range of OEM applications 2) Complete CV joint kits include CV joint, boot, grease, nut and clamps 3) The boot is used to protect against road hazards, while grease keeps dirt and moisture out 4) Quality components and rigorous engineering ensure longer durability Description: On each end of the shaft, there is a ribbed rubber boot that covers a constant velocity joint (CV joint). The AC joint is the flexible coupling that allows the outer wheel to steer. The TJ inner CV joint allows the shaft to follow the up and down motion of the suspension as the vehicle travels down the road.