The best way to retain heat and humidity is to mount your fixtures inside a fully enclosed cage. This hardware will screw into your cage and fastens to one of our dome fixtures on the other end. Hardware allows you to swivel your fixture and direct the light how you choose. We can custom install threaded inserts when purchasing this option so all you have to do is screw your fixture in when you get your cage (note location below). It is also recommended that you order a cord hole grommet in close proximity to your fixture so you can get the cord outside the cage without a huge, unsightly hole that could allow your animal to escape. Exclusive from CBD!