KINGS brand 50 Ohm BNC series RF connectors are the most popular miniature size connectors for coaxial cables from .150 in to .250 in OD. However, designs accommodate .078 in to .437 in cables. The BNC connector is a 50 Ohm constant impedance connector with a frequency range of 0 to 4 GHz. Coupling is a quick connect/disconnect bayonet, particularly useful in test equipment, and is weatherproof.