We lose single irons on the golf course, it just happens. In most cases, single irons are returned to the pro shop where it can eventually be retrieved but in some instances, single irons seem to disappear. We have an inventory of single irons that can help make your set complete once again. We have single irons for many Callaway Golf models and quite a few single irons from other brands. If you are looking for a specific single iron, we would love to help!