Pupil Hall-Little Secret 9 14K Gold with 3 Diamonds 4.5mm x 3mm Total Size Threadless "press-fit" style jewelry. Fits into 18g, 16g, and 14g Threadless posts. This jewelry is a two part piece, the item listed is only the top portion. Does not include the post/backing. Note: Post is intentionally slightly curved to allow for tension. This helps prevent it from falling out of post