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.

Countersunk self-drilling screws for steel are a popular choice for many construction projects due to their efficiency and ease of use. These screws are specifically designed to be used with steel materials, making them a versatile and practical option for a variety of applications.