The 12-inch (30.5 cm) and 18-inch Prime Flex Arm was designed exclusively for AI Prime LED aquarium lights. This flexible mount is highly adaptable and allows you to use it on almost any type of aquarium rim up to 1.20" (30mm). The flexible section of the arm features a silicone coating for easy cleaning from moisture. The screw system included in the clamp allows you to rotate the arm within the base, ensuring complete securing of the AI Prime LED with the bolt connection point. Once your aquarium light is attached to the Flex arm, you can adjust the adjustment screw located inside the base to rotate the arm until it is completely level. Tags: - aqua Illumination mount - prime mount - LED lighting