Threads are a 7/16-20 on the nut side of the stud and on the manifold side a 7/16-14. The unique feature of these studs are that they have an internal broached hex that make installation a snap with an allen wrench.
These studs are sold individual but if wanting a kit with nuts order #900-0007. Stud dimensions are as follows, 7/16-14 coarse .875", shoulder .550", 7/16-20 fine thread .825" with a .200" quick start lead in. There are eight studs for the price.
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.