black allen head wood screws

A wafer head screw, as the name suggests, has a flat, thin, and circular head, resembling a wafer. The head is usually larger than the screw's body, providing a broad bearing surface that distributes the load evenly and reduces the chances of damage to the material being fastened. The self-tapping attribute refers to the screw's ability to cut its way through the material it is inserted into, forming threads as it goes, hence the term self-tapping.

...

In the world of firearms, the M16 rifle stands out as a symbol of military innovation and design excellence. Central to the functionality and reliability of this renowned weapon is a crucial component known as the foundation bolt. Understanding the design and role of the M16 foundation bolt provides insight into the overall operation and reliability of the M16 rifle, which has been a standard issue weapon for many armed forces around the globe.


...