Kessil's Mounting Arm is a premium mounting option that allows you to install Kessil Aquarium Lights directly to your tank. The Mounting Arm is adjustable in heights and from back to front (for 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, A360W/NE, A360, and AP9 (2 required for AP9). Separator What's in the Box Arm (x1) Slide Bar-1 (225.3mm) (x1) M4 Round head hex screw, L=8mm (x4) Arm Mount (x1) Tube Adapter (x1) M4 Flat head hex socket cap, L=15mm (x2) 90 degree adapter (For A160&A360) (x1) A3XX bracket (x1) Plastic Stepper (x2) M3 Thumb Screw (x1) M5 Flat head phillips cap, L=10MM (x4) M5 Thumb screw (x2) 2.5mm M4 hex key (x1) Thumb Screw 3/8-16 (x2) M3 Pan head phillips cap, L=12MM (x4)