The new AP9X Mounting Arm lets the fixture be mounted with a single arm - delivering the most light spread from a single arm mount fixture on the market. The integrated swivel joint allows 60 degrees of vertical rotation and 180 degrees of horizontal rotation.
Front to back adjustment works for 18" to 24" wide tanks
Dimensions: 1" x W 12.32" - 15.43" x H 20.78"