
CHF29.–
K&M Headphone holder with table clamp 16085
K&M Headphone holder with table clamp 16085
I have it on a 3cm rod and it fits great. I'd say on 3.5cm it fits even better. It's ~6.5mm, so I guess it's an M8.
https://www.k-m.de/produkte/zubehoer-fuer-buehne-studio-und-home-recording/kopfhoererhalter/16085-kopfhoererhalter-mit-tischklammer-schwarz