BNC video cables have a variety of uses. They can be used simply as test cables to test a security camera with a DVR or CCTV monitor. They come in handy also for industrial uses like connecting a spectrometer or other industrial machine with BNC video output to a CCTV monitor. They also are useful in connecting balun video receivers to a DVR. In any case, here you can purchase varying lengths of CCTV BNC cables for your project.