This component [A] includes vertical HMS rails and mounting feet that can sit on the side of your aquariums rim.
To build your HMS Multi-Light Mount, please choose the A+B+C components below:
A - AI HMS 2-Arm Kit or AI HMS Hanging Kit
B - AI HMS Tank Mount Rail 24"/36"/48"/60"/72"
C - AI HMS Hydra 32/64 Tank Mount Bracket