TECHSPEC® C, S, and T-Mount Double Thread Rings provide a means to connect two C, S, or T-Mount components. Double thread rings come with either double female threads or double male threads. This allows two C, S, and T-Mount components with the same thread termination to be coupled. TECHSPEC® C, S, and T-Mount Double Thread Rings with rotating ability are also available. The rotation in those rings allows for post assembly alignment adjustments in applications where alignment is crucial.