Cable connector specific for the coax 3. RF shielding effectiveness better than -105 dB, even at temperature extremes. Thin film lubricant on all threads for smooth, non-galling installation. Positive stop feature eliminates need for torque wrenches or special tools: 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. Patented spring mechanism aids in removal.