The panhard rod is responsible for locating the rear end side-to-side in the chassis. Factory panhard rods are made with small diameter tubing and rubber bushings that allow deflection under load. BMR panhard rods are made from larger diameter 1.25", heavy wall DOM tubing and utilize HD spherical rod ends by QA1. The left-hand and right-hand threaded adjuster allows easy "on-car" adjustment. Our CNC machined adjusters are made from 4130 chromoly and have rolled threads. All rod end spacers are 304 stainless. You won't find better quality pieces.