The Edelbrock #8598 are High-Quality 7/16" Rocker Studs used in Edelbrock Cylinder Heads requiring screw-in studs. Sold in package of 2.
The Edelbrock high-quality rocker studs #8590 7/16" (set of two) are used in Edelbrock cylinder heads requiring screw-in studs. Sold in packaged quantities of two or sixteen.