Industrial piercings are basically a pair of piercings that are connected by a single, straight piece of jewelry. One piercing is done in the area of the anterior helix and the other is placed in the opposite side of the ear.
Generally, a single barbell is used to connect them, but many different styles are used.
Industrial barbells which are mostly made of nickle-free surgical steel 316L. The barbell posts have a standard thickness of 1,6mm.