as short description sais - these clamp around your elrs antenna and will allow it to sit tight in mounts that are made for a thicker antenna - in my case that was the tpu mount that comes with the geprc domain 3.6".
If id print them again i'd print them of TPU, but they work printed of PLA as well.
stl has two for your convenience (their identical)
The author marked this model as their own original creation.