An external thread is when the screw is on the outside of the barbell, and the ball has a hole in it that the bar then screws into. Internal threading is where the barbell has a hole in the end and the ball has a screw attached to it that screws down into to the barbell. Internally threaded navel jewellery is best for healing and is a premium choice when selecting navel jewellery. Internally threaded jewellery avoids any possibility of scraping your skin tissue with sharp threads, which is important for fresh piercings. This style of threading assists in preventing the build up of bacteria and germs.
You can find our full collection of internally threaded belly rings at the link below:
https://www.thebellyringshop.com.au/collections/internally-threaded-belly-rings