All of King Racing Products radius rods, tie rods, & drag links are made from 4130 Chromoly. 1 1/8 diameter x .058 wall thickness. The light weight fire hose theaded ends are sweet looking and each end is threaded 5/8 RH and on one end and 5/8LH on the other, so adjustments are simple. Powder coated black for added protection. These Are WoO legal.