The Multi-Light RMS offers a customizable multi-light mount solution for Radion XR30 and Radion XR15 lights. The Multi-Light RMS system features: Built-in cable management Compatibility with rimmed, rimless and euro-braced tanks Rigid yet lightweight construction Anodized aluminum finish Slide mounts for horizontal and rotational adjustment Optimal mounting for Radions at approximately 7 inches | 18 cm above the edge of the tank Multi-Arm Radion Mounting System Part B 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 that fit your setup. Additional parts required - RMS Rails (Part A)- RMS Slides (Part C) * Information as per Manufacturer