This sleek and durable anodized aluminum mounting arm is designed specifically for use with the Aquatic Life Halo Marine Basic and Deluxe LED lighting systems. Featuring an elegant minimalist design, it enables fast and easy intallation of your Halo system. It also includes a hollow inside channel for routing unsightly wires. This 18" model is suitable for tank depths ranging from 14" to 18" (front to back). The included mounting bracket is compatible with aquarium frames up to 1-.25" thick. Supports M4 and M5 screws.