Per Ubiquiti Nanostation Staffa a Parete Loco5AC NS-5AC LocoM5 M5 NSM5 CPE Bridge

This is wall mounting bracket for the Ubiquiti Nanostation line of CPEs. It is designed to attach the device to a flat wall of a building. The bracket will fit both the newer style Nanostation AC as well as the older M5 and M2 series.

eBay