Internally threaded labret studs are very popular and is essentially the opposite of standard threaded piercings.
In this case, the shaft of the labret is hollowed out, and the decorative bead of the labret has a post at the bottom, which is screwed into the shaft itself.
This way, the labret shaft has no post or appendage at the top, making insertion a little bit easier, and the ball can just be screwed in afterwards.
Suitable For - Ear cartilage piercing, lip piercing.
Very durable jewellery and less prone to causing infection as there is no post for bacteria to collect on. It can be inserted much more smoothly.
Internally threaded jewellery has been typically more expensive in the past. Nowadays however, the margin of difference in price has narrowed.