The HMS Double Arm Kit by Aquaillumination includes necessary parts and tools to beautifully mount your Hydra light fixture(s) (not included) above your aquarium. This method allows you to add 1 or more lights on a single horizontal rail (not included) across your aquarium, while enabling you to adjust lighting exactly to your desire. The sleek design of this mount will give your set-up an elegant and modern look. Spoil yourself with high-quality design for your high-quality aquatic environment.