Coax-Adapter Straight C3b - C6b ZilverCable connector specific for the coax 3 and coax 6. RF shielding effectiveness better than -120 dB, even at tempature extremes. Thin film lubricant on all threads for smooth, non-galling installation. Positive stop feature eliminates need for torque wrenches or special tools, which results in consistent installation every time. Patented anti-rotational feature wich prevents cable rotation during installation. Center conductor mark on all connectors for accurate cable preparation. Self locking feature prevents back nut loosening caused by cable vibration. Only one wrench size needed for each connector. The patented spring mechanism aids in removal.