Standard N female connectors for use with LMR-400, RFC400, RG-8/U or Belden 9913 (Group I) Coax cable. They are used for a wide variety of connections to terminate coax at a N male jack. The body plating is Silver, the center pin is Gold and the dielectric is Teflon. Center pin attachment is a solder type, and outer ring is crimp (.429 crimp tool needed).