Maven B.2 11x45 tripod stud question

[Virginian]

I bought a used set of maven b.2 11x45 and it came with a stud attached. I'm trying to figure out what the system the stud works on (see attached photo). Can anyone help identify it? I'm looking to buy a tripod setup.

 

[T_Widdy]

Vortex

 

[accountantsanonymous]

Looks like the Vortex stud.

 

[Virginian]

Thanks!