Are you wanting to create your own lights then you will need this wiring to do just that. You can also purchase either the C7 or C9 sockets separately through us. Modify the light strand as you want it. If you want dead areas & Bulbs in certain places, then you definitely need this and to do it yourself. Easy to work with and our sockets are water tight so can they even be used outdoors. Don’t forget you need to make sure you get your plugs and outlets.