Joint Properties - Type: UHF Female to UHF Female connector.Used to connect PL259 male connector or UHF coaxial cable. Impedance50 Ohm Body Material:Pure Brass Body Plating:Nickel Inner Needle: Brass Silver Plated Insulator:Teflon (PTFE) Life expectancy:> 1000 times the service life. Low Loss & Low SWR - The signal attenuates of PL-259 female to female connector is less than 0.1dB.VSWR is less than 1.15(DC-1G).Made of brass copper and teflon Insulator for a reliable signal. Neither measurable SWR increase, nor signal loss. Package Included - 2 PCS UHF SO239 Female to UHF SO239 Female Connectors.(Salt Spray Test:128 hours) Applications - Suitable for join pl259 connector cable and device indoors and outdoors. Fit for CB HAM Radio, VHF Radio, Antenna, SWR Meter, Antenna Analyzer, Amateur Radio etc.