ARP Carb Studs are comprised of Chromoly with a Black Oxide Finish. These studs will assist with gasket placement and securing your carburetor to the intake manifold. 3.7" stud length is excellent for use with 2" carb spacers. Studs have a unique nut-starter radius to help prevent cross-threading. Thread size = 5/16". Sold as a set of (4) with studs, washers, and hex nuts.