Internally threaded piercing refers to a type of piercing jewelry where the thread for screwing in the decorative end piece is located inside the bar. The decorative part, for example, a ball, has a screw that is inserted and screwed into the hollow bar. This design ensures that when inserting or removing the jewelry, only the smooth part of the bar passes through the piercing channel without sharp edges of the thread. As a result, this type of jewelry is gentler on the tissue, especially for fresh or sensitive piercings, as it reduces the risk of scratching and irritation.