High-frequency, broad-band signal are transmitted through RF patch cords, primarily coaxial cables. They are suitable for functioning as test leads in a laboratory or for carrying radio and radar signals. Coaxial cables with BNC plugs are particularly popular. They have bayonet locks that prevent them from accidental disconnection. Their areas of application range from audio and video to measurement of electric voltages in oscilloscopes. SMA and SMB plugs are equipped with threads and bolts for a secure connection and serve to extend antennas for WLAN devices. Coaxial cables and FME plugs are especially filigree. They are used for mobile wireless applications in vehicle construction.