Summary

This is a buzzer mount that is meant to sit on the outside of front frame braces. I use it on my Apex and RR Flow frames but will probably work with more.

The buzzer is a 9mm x 5.5mm EUDAX:

https://www.amazon.com/EUDAX-Tracker-9X5-5mm-Quadcopter-Control/dp/B071ZP615Y/ref=sr_1_1?dchild=1&keywords=eudax+buzzer&qid=1608400141&sr=8-1