Teleprompter

You need to glue it together and add 4 m3 screws.
To attach to the camera you would need an 84 mm ring adapter.
It has been designed for use with 204x94x1.9 mm
teleprompter glass I bought here https://ebay.us/mPkLOD

It's an open design https://cad.onshape.com/documents/d19e80b0b90cb04665f5d6ad/w/6aa241ff2050f3e3e5133f27/e/bd5fe8fafaee773cabe7e384