This adapter is a feedthrough which is made to adapt Fischer S103 1-pin (Socket/Female) to BNC (Plug/Female). If you have any interconnections which needs to adapt between the two, this is the solution. This adapter was designed for users who need to verify and/or calibrate their EFT/Burst attenuator which utilizes the Fischers F103 plug (Popular adapter for verification/calibration with EM Test CA EFT Kit: KW 50 (50Ω) & KW1000 (1kΩ)) . Simply connect this between the two and you are set! Plug and play! See photo for reference, contact us if you have further connector needs and we will do our best to find a solution for you!