Air-Tite "A" Black Ring Coin Holder for 18mm Coins Air-Tite Holder with Black Ring for Dimes 1838 to present, Three Cent Nickels, $2 1/2 Gold 1809 to 1929, or $2 1/2 Gold Commemoratives (18mm) The outside diameter of the "A" holder is 1.218" (30.93mm) Each order is for a single holder with ring