Complete set of patented, made-in-the-USA, rebuildable, Dynatrac HD Balljoints™ for 2007-2018 Jeep Wrangler JK and 1999-2004 Jeep Grand Cherokee (WJ). Fits stock front axle or Dynatrac ProRock 44™ for Jeep JK applications. Dynatrac HD BallJoints are the strongest, most durable and highest quality available anywhere, featuring heat-treated high-strength billet bodies with chromoly stems. The heat-treated, precision-ground stainless steel ball meets military specifications. Unique seals prevent contamination, and the ball joints have greasable fittings and Teflon-coated wear points to provide a long, durable life. Dynatrac HD BallJoints are rebuildable -- they can be rebuilt on the vehicle with common hand tools.