ARP 1347121 High Performance Series Rocker Arm Studs - Set of 2 Manufactured to high tolerances so they run-in straight and true, and the extra-large radius base offers greater resistance to flex Lengths are exact, designed to provide positive seating every time Made from 8740 chrome moly forgings and heat treated to 180,000 psi; excellent for E.T. Bracket Racing, limited rule oval track competition, and street use Stud dimensions are: 1.750 overall stud height, .700 screw-in thread depth, .800 adjuster thread depth, 3/8-24 shank diameter and thread, and 7/16-14 base diameter and thread Designed for use with ARP's patented Perma-Loc adjusters, not OEM-style self-locking nuts