Plastic butterfly screws are used in an variety of ways to prevent or against screwing molds. They are also used to anchor objects in a way that makes them easy to use. Plastic wrenching screws are used in molded applications so that they can not be removed from the surface.
Plastic butterfly screws are used to force pneumatic into a air compressor. However, they are also used in installing screws as drying plugs on shelves, walls, and ceilings.