Rivet Nut, also known as a threaded insert or blind rivet nut, is a fastener that is used to securely join two or more objects together. It is a cylindrical metal fastener that has a threaded hole in the center and is designed to be installed from one side of a workpiece, hence the name "blind" rivet nut. Rivet nuts are commonly used in applications where access is limited or where a strong, reliable connection is needed. They are installed by drilling a hole in the workpiece and then placing the rivet nut into the hole. Once inserted, a special tool is used to expand the base of the rivet nut, causing it to grip the sides of the hole and creating a secure, threaded connection. Rivet nuts are made from a variety of materials, including steel, aluminum, and brass, and are available in different sizes and thread types to suit different applications. They are widely used in the automotive, aerospace, and construction industries, as well as in DIY and home improvement projects.