Nuvo Iron HALF ROUND DECORATIVE GATE FENCE INSERT ACW63 Fencing,Fence,Gates,Home Add beauty to your new or existing fences, decks, gates and walls with this simple decorative aluminum casting This affordable accessory is easy to install and offers greater decorative flexibility. Item comes in two pieces. Cut-out template included. Cut out hole, then insert one half of insert from one side and the other half from the other side and they connect through the hole. Half Round 9.75" Diameter Black Aluminum Insert is hollow (some photos show it being that you can't see through it but they've added a glass to it.