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BA-28F
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 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.