If I understand what you are saying, this measurement would be how close the rings would be to each other if you slammed both of them up against this thing. Not sure what to call it either, but my new Swift model 653M scope (fixed 4x40) has one that is a hair shorter than 1-1/32". You might look at their website and see if they use the same controls on all of their scopes. Let me know if you want the other measurements off of it. I think it should be called the "Billy and them" part of the scope.