All ring tops have a nut thread which allow them to connect to the ring band's bolt thread. All Minimalist Ring tops can be interchanged with all other Minimalist Ring tops and fit on all Minimalist Ring bands. All Maximalist Ring tops can be interchanged with all other Maximalist Ring tops and fit on all Maximalist Ring bands. If you have any questions about our rings' functionality and mechanisms, please email us at hello@defenderring.com