This is the BNC Male to Reverse Polarity SMA Female adapter. It features a BNC Male connector on one side. And a Reverse Polarity SMA Female 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 Reverse Polarity SMA cable into a BNC cable. The BNC Male to Reverse Polarity SMA Female adapter is a quick and easy solution for your cabling projects.