AI Prime Flex Arm 12inSimple, yet highly effective modern designThe Aqua Illumination Prime Flex Arm was designed to exclusively work with AI Prime LED lights. The mount is very robust, and adaptable allowing you to use the Flex Arm on any type of aquarium rim up to 1.20" (30mm). The flexible portion of the arm has a silicone coating allowing easy cleaning while protecting it from moisture.The included set screw system allows you to twist the arm within the base letting you fully secure your Prime LED to the screw attachment point. After your Prime has been snugged to the Flex Arm, you can loosen the set screw located within the base and twist the arm until it is perfectly flat, then tighten the set screw (do not over tighten the set screw, hand tighten only). One of the biggest issues with mounting lights can be wire management, and the Flex Arm even has that covered, supplying clips that can attach directly to the Flex Arm and secure the power cord for the Prime LED, keeping things neat and clean.