What is the name of this plastic part with screws and how to use it?

This is a typical plastic expansion screw. The usage of this screw should be to first punch a hole in the wall with an impact drill, then punch the plastic part into the hole with a hammer, and then screw the screw into the plastic, and the plastic will expand and then play a fixed role. This is not easy to loosen, but it is quite stable. The principle is the same as that of metal expansion screw, which can be understood in this way. If you have any unclear questions, please ask.