Originally Posted by
Dano Moparo
Everyone calls these Christmas trees, maybe the proper name is be push pins, but there are way too many retainers that fit that description.
These are called rivet-screws, usually have a flat or phillips head. Some just push in by your thumb and expand like a rivet.
The ones you push with your thumb but have to take off with a flat head by prying out the center circle... maybe im just crazy.