Welcome Exterra (and shoot for Scope Rings)

[Exterra]

Is 17-4 the thread size or the kind of stainless? I would like to know the thread size.

17-4 is the type of stainless alloy, it is extremely hard/durable. The thread size will be dependent on the action that you are mounting to

 

[wildwillie]

Thanks, I'm mounting it on a Tikka t3x hunter in .308 caliper