This is the Reverse Polarity SMA Male to TNC Female Adapter It features a Reverse Polarity SMA Male adapter on one end, and TNC Female on the other. The adapter is made with a nickel-plated, metal construction for maximum signal strength and durability. The adapter will allow you to quickly change the gender or connector type on an already-terminated cable. The Reverse Polarity SMA Male to TNC Female Adapter is a quick and easy solution for your cabling projects. For more information on our products, please contact our customer service department at 888-519-9505. For all your cable and connector needs, choose Show Me Cables.