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. Aqua Illumination constructed the HMS Mounting System and its components vastly out of high-quality aluminum that will not rust over time and keeps things lightweight. The mounting feet can accept any thickness of tank, whether rimmed or rimless it doesn\’t matter. HMS Mounting System Components: HMS Multi Light Mount Kit – Includes vertical HMS rails and mounting feet that can sit on the side of your aquarium\’s rim. HMS Single Light Mount – Includes vertical & horizontal HMS rails with tank attachment to mount a single Hydra LED light HMS Hanging Kit – Allows you to suspend the HMS Tracks from your ceiling or wall brackets. HMS Multi Light Track – Select the track that matches the length of your tank HMS Hydra 32 or HMS Hydra 64 Bracket – Custom brackets that hold your particular Hydra LED light and lets you slide and spin each light individually for the perfect positioning. What\’s Included? 2x Mounting Feet 2x Pivoting Brackets 2x 15\” Vertical Rails