A rivet nut, also known as a blind rivet nut, or rivnut,is a one-piece internally threaded and counterbored tubular rivet that can
be anchored entirely from one side. It is a kind of threaded insert. There are two types: one is designed to form a bulge on the
back side of the panel as a screw is tightened in its threads. The other is similarly drawn in using a screw, but is drawn into
the sleeve instead of creating a bulge.