Mr. Gasket Carburetor Studs put an end to stripped-out threads in cast aluminum manifolds. They hold the gasket in place and perfectly align the carburetor in position. Zinc-plated and 1-1/2 inch long, they have 5/16-18 threads on one end and 5/16-24 on the other, come in a package of four, and have four matching nuts and washers to complete the job.