This is a mailbox flag system with multiple flags for different holidays and decors. Halloween, Christmas, and Fleur de Lis Flags are available so far, hopefully with more to come.
There are two versions of the mount;
Version 1: the original version provided by Jdpurcell's Mailbox Flag. To change flags, this requires the entire mount to be taken off the mailbox. This version is simpler because it only requires two pieces to be printed and simple bolts/nuts. Preferred for those who don't plan to change their flag much.
Version 2: This is still in beta but is working well for me so far. This version has 3 parts: a portion inside the mail box and two portions outside of the mailbox. This version requires (4) m3xD4.2xL3.0 Hot melt inserts (other sizes with the same diameter will likely work) and 4 M3 Countersink screws. I prefer this version because flag changes are as simple as removing two screws without having to deal with the nuts.