SMART Board Installation Manual page 28

3. Align the top two corner brackets with the threaded posts on the overlay, and then
loosely attach thumbscrews to hold the brackets in place.
You'll need one bracket from each set. Put the corner bracket with the triangular notch
in the top-right corner (when you're looking at the back of the overlay), and the bracket
without the notch in the top-left corner.
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TIP
There is an arrow engraved on the rear of each bracket. If you position
each bracket in its appropriate corner, all of these arrows will point
upwards.
Installing the Interactive Whiteboard