Aqua Illumination HMS 60 inch Rail The HMS Multi Light Mounting System is composed of three individual components that let you customize the mounting system for your exact tank and number of Hydra LED modules. The track system lets you slide your lights from side to side allowing you to position them perfectly for the best coverage and reduction in shadowing.Just select the track that is appropriate for your aquariums total length (plus1.5) and that will allow you to use the HMS Multi Light Mounting Kit to support the track or the HMS hanging kit to suspend it from the ceiling or wall brackets. HMS Tracks are made out of high-quality aluminum and will not rust or degrade over time.HMS Mounting System Components:HMS Multi Light Mount Kit- Includes vertical HMS rails and mounting feet that can sit on the side of your aquariums rim.HMS Hanging Kit- Allows you to suspend the HMS Tracks from your ceiling or wall brackets.