Plexiglas 4mm bracket for ~3mm screw

For a project I need some brackets because I don't want to drill through the plexiglass. For my use case I don't see the brackets as I mount the glass from "behind" so function > design.

It's for 4mm thick plexiglass and 3mm screws.



Its a very special use case, but maybe someone needs it. The .obj file is included.