With their ball-in joint, massive 2.5in diameter body, and huge 1.25in threads, these X-Flex Joints offer considerable range, strength, and safety for off-road applications. Rough Country's X-Flex Joints now also feature Adjustable Retainer Rings, allowing you to preload the bushings by compressing them prior to install. A threaded chamber inside the housing offers the ability to modify the amount of compression on the bushings and friction on the spherical ball at any given time by simply adjusting the end retainer ring using our included adjustment tool.These upgrades drastically extend the longevity of the joints themselves since they are completely rebuildable for easy maintenance and adjustments. A few quick twists and your joints will be as tight as they day you installed them. Upper Arm X-Flex Joints pivot up to twenty degrees, while Lower Arm Joints are capable of a staggering thrity-five degrees pivot range.