Antenna cable connector SMA female to female bulkhead jack adapter Help you connect SMA male to male converter or external cable, commonly used in RF Applications, Antennas, Wireless LAN Devices , Coaxial cable, Wi-Fi Radios External Antenna, GPS and so on, >1000 Times Mating Life Time. Barrel connectors have a knurled grip which comes in handy while tightening SMA connectors to the barrel Connector Material: Pure brass with Great connectivity (Not Alloy), Surface treatment: Gold-plated, Impedance: 50 ohm, Low-loss Package included: 5 pieces SMA Female to Female bulkhead adapters.