This is and adjustable microphone stand headphone hanger.
It consists of two parts that go around the stand. The two pieces join together with M5 screws and nuts, and thanks to that they can perfectly fit different stands diameters.
One of the pieces has the slots to perfectly fit the nuts. If the nuts don't fit very tight into the hole you can use superglue to fix them in place.
For the screws you can print the screw cap to easly mount this stand or even you can also use the GoPro screws since they're also M5.
The author hasn't provided the model origin yet.