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. Upper Arm X-Flex Joints pivot up to twenty degrees, while Lower Arm Joints are capable of a staggering thirty-five degrees pivot range.Fully greasable. Increased longevity. Upper joints pivot up to 20 degrees. Lower joints pivot up to 35 degrees. Allows for greater articulation off-road.Recommended for models with 0in - 6.5in suspension lift kits.4-6 hourshttps://s3.amazonaws.com/roughcountry/install/92119100.pdf1993-1998:2WD:Jeep:Grand Cherokee;1993-1998:4WD:Jeep:Grand Cherokee;1997-2006:4WD:Jeep:Wrangler TJ;2004-2006:4WD:Jeep:Wrangler TJ Unlimited