7/16 In Suit SB Chev Ford & Holden. Rocker Arm Studs High Performance 7/16-20 In. Thread 1.77 In. ARP High Performance Series Rocker Arm Studs Are Ideal For Et Bracket Racing Limited Rule Oval Track Competition Or Street Use. Made From 8740 Chromoly Steel And Are Heat-Treated To 180000 Psi Tensile Strength They Are Concentric Within .005 T.I.R. Thread Pitch To Thread Pitch Which Will Give You More Consistent Rocker Geometry