From the top of the wall mount of this large impressive brass bulkhead light with copper rain cap cover to the bottom of the cage, this light measures 14 inches long. The copper rain cap cover that we added measures 9 inches wide and now has a rolled outside edge. The four mounting holes measure 5 1/4 inches on center of each other.  The base itself measures 4 5/8 inches from one side to the other. When mounted to the wall, this large impressive brass bulkhead light will extend out from the wall by 10 inches. This light weighs over 11 pounds, and is 100% cast brass. You can use this light inside or outside – it will never rust!