Carburetor Stud - 5/16-18 and 5/16-24 in Thread - 3.000 in Long - Hex Nuts - Steel - Zinc Oxide - Set of 4. Our goal is to exceed your expectations. And we’ve built a system to do just that. Occasionally, there may be an issue with your item or your order and we will do our best to ensure you are 100% satisfied.