These rings use strong, recoil resistant hardware to ensure that your sighting stays accurate longer than with other rings. Ruger 5B30 Blue High Profile Scope Rings can accommodate rifle scopes with a tube diameter of 30mm and an objective lens diameter of up to 52mm, allowing you to use a wide range of scopes and magnification levels. Ruger has designed these scope rings to be mixed and matched with other Ruger riflescope rings to attain an optimum fit for your purposes.