Cardone Select 66-4251 New Constant Velocity Drive Axle New axle nuts are supplied, where applicable, for hassle-free installation 100% Neoprene boots ensure excellent ozone resistance which eliminates cracking, a leading cause of boot failure Boot clamps are pneumatically crimped creating a perfect seal between the boot and housing High quality grease withstands high-temperature and high-torque demands which extends joint life High-tech grinding machines maintain the original design of the outer housing, race and cage to guarantee reliable performance