An externally threaded piercing is a type of jewelry whose main part, the bar or „barbell“, has a thread cut into its end. A decorative end piece, such as a ball, which has an internal thread, is then screwed onto this external thread. When inserting or removing the jewelry, the edges of the thread thus pass through the pierced tissue, the so-called „piercing channel“. This process can cause irritation or microscopic tissue damage, especially in fresh or sensitive piercings. This fastening mechanism is more common in older or more affordably priced types of piercing jewelry.