Connector name: SMA female to female antenna connector, SMA female to female jack (hole) bulkhead coaxial adapter. Both sides are SMA female jack (hole) coaxial connectors. Connector material: Pure brass with Great connectivity (Not Alloy), Surface treatment: Gold-plated, Impedance: 50 ohm, Low-loss BOOBRIE SMA barrel adapter have a knurled grip which comes in handy while tightening SMA connectors to the barrel. BOOBRIE SMA female coaxial adapter is used to connect a SMA male plug (pin) connector, SMA male cable or a high radio frequency equipment with SMA plug. BOOBRIE SMA jack is 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. Package included: 10 pieces SMA to SMA female bulkhead coax adapters.