Q : How do you insert these? Are they 2 piece (like a thread or screw) or is this 1 piece I would have to pop through the holes?
A :
It is 1 piece nose bone type. Nose bone is a straight post ends in a small fixed round ball. This ball is a bit thicker than a stem but small enough to pass through your nose piercing but good enough to keep the nose ring from falling out.