TOP SCREW METAL CORP.

A rivet nut  is also known as a blind nut, nut-sert or blind rivet nut which is  a one-piece internally threaded and counterbored tubular rivet that can be anchored entirely from one side. 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.

The first rivet nut was created by BF Goodrich in the 1930s and named the rivnut. It was used to mount rubber de-icing boots to aircraft wings.

^{In the field of aviation, rivnuts are often used to attach various items, such as static wicks and inspection access covers, to the surface of an aircraft.}

Rivet nuts are available in body styles of round, splined, hexagonal and square - head styles of flat, flanged, low profile and countersunk in materials such as aluminium, steel, stainless steel and brass.

^{(Reference by Wikipedia)}