Because the multi-light RMS is a modular system, choose the components that fit your needs. To build a mount you will need a set of arms, the right rail for your tank and the number and model of light mounts/slides that fit your setup. It’s as simple as A,B and C. Modular component for the Radion Mounting System allows endless customization options. EcoTech Marine RMS Arms Kit provides a convenient multi-light mounting solution for your EcoTech Marine Radion LEDs, elevating your fixtures optimally at approximately 7 inches above the glass. Compatible with rimmed, rimless, and euro-brace aquariums. Durable construction with anodized aluminum finish. *RMS Track and Slides required and sold separately.