Metal expansion nuts, often referred to as expansion anchors or expansion inserts, are specialized fasteners that expand when a bolt or screw is threaded into them. They typically consist of a cylindrical body with slits along its length or an expandable design that facilitates outward expansion. The main purpose of these nuts is to create a secure grip within a substrate, such as concrete, wood, or metal, thereby preventing loosening due to vibrational forces, temperature fluctuations, or stress.

The furniture industry also benefits from the use of Wing Tek screws, particularly in flat-pack assembly. With the growing trend of DIY furniture, these screws enable consumers to assemble products quickly and securely. The design allows for straightforward installation, often requiring minimal tools, which is an attractive feature for consumers seeking efficiency and simplicity.