Aqua Illumination HMS Single Arm Kit The HMS Single Arm Mounting Kit is perfect for tanks that only need a single Hydra LED unit, or if you want to have multiple units without a rail running across your tank. The kit comes with mounting brackets for the FiftyTwo and TwentySix series of LED lights that can slide forward, backward, and also twist within the rails for the ideal position. The height of the mounting system can also be adjusted making it a great industrial looking mounting system for the Aqua Illumination Hydra LED lighting systems. Includes brackets for Hydra TwentySix and FiftyTwo Lights.Rails can slide for positioningClamps on rimless tanks up to 3cm thickLight brackets twist for perfect coverage Between the HMS Rails, and the modular mounting brackets for the tank, and the light the HMS Single Arm can be fully adjusted to fit virtually any size tank from 10 gallons and up. Specifications:Max Rimless Tank Thickness - 3cmMax Height - 13.0Max Outreach - 14.3 What's Included?1x Hydra FiftyTwo Bracket1x Hydra TwentySix Bracket1x Pivoting Bracket2x Mounting Clamps2x 15 Rails Note - Designed for rimless tanks and not guaranteed to fit with rimmed aquariums.