This is the BNC Female to Reverse Polarity SMA Male adapter. It features a BNC Female connector on one side. And a Reverse Polarity SMA Male connector on the other side. The adapter is made with a nickel-plated, metal construction for maximum signal strength and durability. The adapter will allow you to change a BNC cable into a Reverse Polarity SMA cable. The BNC Female to Reverse Polarity SMA Male adapter is a quick and easy solution for your cabling projects.