Holder for Window Shutter

Had to replace a broken window shutter holder. Since it was weekend and I didn't know the name of this thing, I just constructed one on my own in openscad. I included the source, but it is really a simple thing and not very elaborated.

I printed this in PLA but I have yet to see how it works if it gets hotter outside. Maybe ABS would be a better choice.

BTW: This fits an M4 screw.