This is a case for the Sunton 7" display [1]. I only used it for the non touch version, so i could be that it doesn't fit with the touch version of the display.
You need 4xM3x8 screews and 4xM3 nuts. Just press the nuts into the Frame.
It is part of my smart Mirror project, embedded in my Home Assistant. If you are interested check this link out [2].
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The author marked this model as their own original creation.