The Screwbidoo belly bar is available in the following sizes:
6mm (1/4")
8mm (5/16")
10mm (3/8")
12mm (1/2")
14mm (9/16")
It is important that you select the correct length so it fits your piercing. Measurements are taken in a straight line on the inside of the top ball (smaller one) to the inside of bottom ball (larger one). This can be done on your current belly bar using a standard flat ruler or a digital vernier gauge if you have one.
The example below shows a measurment taken using a vernier gauge and shows that the belly bar is roughly a 10mm (3/8") size.


