This SMA male pin to male Pin plug commonly used on WiFi antennas, radio, RF coaxial coax, extension cable, so on. Made with high quality brass, gold plated, easy to install, for better signal transmission and corrosion protection. Impedance: 50Ω SMA male: pin in center, internally threaded nut. Come with 5-Pack, which can save you much and makes you always have a backup.