Keyholder with place for m3 threaded inserts.
I used these ones https://www.amazon.de/STCRERAG-Gewindeeinsatz-Einpressmutter-Schmelzgewinde-Kunststoffteile/dp/B095VW7GBW/ref=sr_1_4?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=20KKAD8K1PSJP&keywords=threaded+insert+m3&qid=1648722618&s=diy&sprefix=threaded+insert+m3%2Cdiy%2C89&sr=1-4
but if you check the dimensions every other one should fit as well
The author hasn't provided the model origin yet.
