These magnet mounts are for mounting antennas with 1 1/8 inch x 18 thread (commonly known as NMO or Motorola). This is a 3 1/4 inch magnet with a 12 foot RG58/U coax. They are available in black or chrome (selectable above). Both types are available with BNC, PL259, or no connector. Black mounts are also available with TNC connectors. The PL259 connectors come pre-attached. The other connectors come unattached. Installing the connectors will require soldering.