Model Y65 Air-Tite holders have an inside diameter of 65mm (2.559"), an outside diameter of 71.37mm (2.81") and an inside depth of 5.48mm (0.216"). They will fit most 5oz. silver rounds. They also come with a variety of ring sizes.Model Y63 holders have an inside diameter of 63mm (2.48") and the same ouside diameter and depth. They will fit some 2oz. silver rounds.