Kessil's Mounting Arm is a premium mounting option that allows you to install Kessil Aquarium LED's directly on your tank. The Mounting Arm is adjustable in height from back to front (18" - 24" wide tank), together with advanced cable management to house the cable inside the arm, providing a perfect and sleek mounting option for rimmed and rimless tanks. It is compatible with A160, A360, and AP700 (Two Mounts are Required to mount an AP700 Fixture). Dimensions: 1" x W 12. 32" - 15. 43" x H 20. 78"