This galvanized installation collar will make putting your firepit in a breeze. Fits pan size 31", 32" ID, 38" OD. Mortared in just below the top course of the enclosure. Makes pan and valve box easy to access. The ID and OD of the installation collars differ by 6" to allow a small space between the side of the pan and the collar, as well as 1" or more of the collar to project into the body of the enclosure and mortared in if desired. The collar should be installed into the enclosure while it is being built. Collar should be 2-4" below the top of the enclosure. Shipping is free, however we ship only within the continental United States.