I find this Annex Quad Lock system super. The Annes Quad Lock smartphone cover on the rear panel via an interface to the all Annex Quad Lock adapter can be connected. I bought the Tripod Adapter for perfect panoramic photos and sometimes also to make to longer recording times. The adapter is made of plastic. Meanwhile, I have to recognize that in some cases for months in use and it is not Vergang or wear. The products are not cheap but worth the money anyway.