NMO to 3/8 X 24 Thread: This adapter can convert a NMO antenna mount connector to a 3/8" x 24 antenna mount connector like CB mobile antennas without changing the mounting base Specially for CB Antenna Mount: The 3/8 x 24 Antenna Adapter can be closely integrated with cb whip antennas and compatible with TRAM, Fire Stick firefly cb antenna; for Pro Trucker, Francis, Hustler, RoadPro, Browning, Wilson cb antenna and more Excellent Signal Transmission: The center contact of NMO 3/8 x 24 Antenna Mount adopts premium brass material to reduce signal loss, ensure efficient and stable transmission of RF signal, improve communication quality and works well even at low temperatures Rubber Seal O Ring: The 3/8 x 24 to NMO mount's shell fully wrapped in rubber, is insulating and waterproof to prevent current leakage, shields against electrical interference, and ensures stable operation in wet environments Swap Antennas with Ease: This NMO to CB Antenna Adapter allows you to swap NMO antennas without changing/ adding another mount, just simply insert the antenna and tighten it firmly, and will not break your whip antenna easily This NMO to 3/8"x24 adapter permits 3/8"x24 type antenna to attach to an NMO mount and realize the adaptation between different interface devices