These rings have an optical centerline of 1.030". Optical centerline is measured from the top of the mounting base to center of rifle scopes main tube.
These rings have an optical centerline of 1.170". Optical centerline is measured from the top of the mounting base to center of rifle scopes main tube.
These rings have an optical centerline of 1.305". Optical centerline is measured from the top of the mounting base to center of rifle scopes main tube.
These rings have an optical centerline of 1.440". Optical centerline is measured from the top of the mounting base to center of rifle scopes main tube.