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Simple wall or panel fixing, will fit any screw size under 5.5mm diameter.

Print without supports, both parts A and B are in the same STL but will separate after printing.

If you need a wall plug/dowel to affix this to a wall I have one of those too: https://www.thingiverse.com/thing:4721406

Autodesk inventor files are also in the folder.

UPDATE:
Added a smaller version called "Both parts MINI