It's common in electronics to use only screws to hold a box together, instead of having screw nuts at the other end of the box. There are raised supports into which the screws are screwed into.
They look like screw anchors, but that means something different. In other languages (e.g. German) the word "dome" is used, but in English itthat means the small cover on top of the screw used to hide it.
What are these things (painted green on the image) called? In the whole list of screw-related topics on Wikipedia, nothing similar turns up.
