SmallHD Mounting Cage for 503 UltraBright Monitor provides mounting points for accessories on its left and right sides through the use of two metal brackets, threaded with 1/4"-20 and 3/8"-16 threads. Also feature slots for attaching an optional dedicated sun hood for this monitor, which secures by magnetic mini-rods into these slots. Four screws are included for attaching the cage to the monitor.