Impedance: Style:straight | Material:Brass | Plating:Gold-plated |50 Ohm. SMA-UHF Coaxial cable connectors firmly mate to each counterpart which provide the low loss resistance connection. This coax conector kit includes 4 adapters to cover all your needs. It consists of 1X SO239 FEMALE jack to SMA MALE coax adapter, 1x SO239 FEMALE jack to SMA FEMALE coax connector, 1x PL259 MALE plug to SMA MALE connector, 1x PL259 MALE connector to SMA FEMALE plug. Anian VHF adapter are compatible with a wide variety of devices, including SWR/CB Radio / Handheld Ham Radio Antenna / Walkie Talkie / Amateur radios / mobile ham radio / sdr dongle / NanoVNA. Those UHF coaxial adapter is well made and provides for all the possible needed connections from a Ham handheld GMRS radio SMA fitting to the UHF antenna connector. some ham radios use a male SMA connector and some a female. So it is good to have both kinds of them.