One of the first things to consider when getting an iron candelabra centerpiece is the size and number of candles it can hold. Some candelabra centerpieces can hold three pieces, while others can hold up to six or ten. Also, the more candles it can accommodate, the larger it becomes.
When it comes to the size, there are no hard rules. However, the iron candelabra centerpieces should not be too small that it will be overshadowed by the table's size. Also, it shouldn't be too big that it starts consuming too much space that you can't do anything sensible while on the table.