This model OA345400Z01 is N Female Straight to TNCA Female Straight. This series N Female Straight to TNCA Female Straight have the operating frequency of 18 GHz. Adapters that have a male to female or plug to jack configuration are known as connector savers.
Between Series Adapters are the passive components which are used to transfer signals from one coaxial connector interface to another with minimal losses. Between adapters have different connector configurations on either side of the adapter.