BA-21P

Must Read This Page Before Customization（Click The Below Link)
You can know what all the nouns refer to, the dimensions that can be customized, and the accessories you can add for a cage such as PA hook,etc.
All About Chastity Cage Customization (badassworkroom.com)
 

The default base ring is solid ring, and the hinge rings shown in the profile picture are only for the purpose of demonstrating this possibility of production,we don't recommended to use hinge ring as base ring. If you really want a hinge base ring, please leave a note in the any text box.

The below 3 sizes is must needed:

1.Chastity Cage Overall Length

2.Penis Tube Inner Diameter 

3.Base Ring Inner Diameter

Warm tip: if you are not very sure about the base ring diameter or want to try one more size of base ring,you can choose "cage with 2 base ring" to place the order.