These Air Force medallions are sold in pairs, and are
about 3/4-inch diameter. They are suitable for some larger
double action and single action revolver grips, but not
the medium and smaller sizes. They are best suited for
flat grips like the Colt 1911 and similar styles.
The backs of these normally come with tie-tack pins. I remove
this and mount it in the gun. If you order here, I just
send the medallion with the pin back and retainer, so you
can either use as a pin or remove and mount, as you wish.