It is made from a 7075 alum. that has been anodized for wear resistance and has relief machined in the shank of the stud to allow the stud to break before damaging the supercharger case. The stud has 7/16-14 threads on the manifold side and standard 7/16-20 for the manifold nuts.
Studs fit most SSI, Kobelco, Whipple or screw blowers but will not fit Mooneyham, Kuhl, Littlefield, BDS or Blower Shop superchargers. Stud length is 2.155" not including the top, including the starter top 2.255".
Studs are sold individual. RBS also can supply7/16 AN washer #420-0007, and 7/16-20 12 pt. nut steel #450-0017TP.