The unique feature of these studs are that they have an external machined hex that make installation a snap with an 5/16" wrench. The hard anodizing helps prevent galling and the alum. provides light weight while providing a safety factor in the event of a supercharger backfire saving your supercharger or manifold. The threads are a 7/16-20 on the nut side of the stud and on the manifold side a 7/16-14.
Measurements of the blower stud are coarse thread is .875", shoulder is .750" and fine thread is 1.200".
These studs are sold individual but if wanting a kit with nuts order #900-0006 or 900-0006A.