The monitor bracket allows you to mount an on board monitor on your preston HU3. the cavity around the screw provides a sturdy capture of the bracket preventing it from twisting off like an israeli arm. this bracket also provides a mounting shoe so that you can still use the preston microforce bracket. the bracket is rated for up to 13lbs (the weight of a 17? monitor!) so it’s plenty sturdy enough for any on-board monitor with a teradek & even an anton bauer battery.