This plug and socket set is suitable for use with our reversing systems that use the 4 pin connectors. It is a medium duty model suitable for use on trailers or caravans. The coil is 0.8m long and stretches to 1.6m easily (measurements approximate). When connected it forms a locked waterproof join. Each socket has a cover to keep moisture out when not in use. The sockets are relatively small and will fit in a hole approximately 2cm diameter. The front lead is 5m long and we asked for the rear to be 15m long - we suspect it is a little longer. The set carries the signal from one camera. These are sometimes supplied with 5 pin or 7 pin coils. Please contact us if you have these already fitted and you want the correct type.