J Hook Trees & Components. J hook trees offer real structure and speed to you cabling install. We have standard J Hook assemblies available to fit many applications. We work with the manufacture as well as our own assembly department so we have the ability to create a wide variety of custom assemblies with fast turn around times. We also offer the components so you can build what you need on site. If you don't see what you need, give us a call and let us work for you to come up with a solution.