After assembling it, the '3' pieces do not have a screw or peg to keep them attached to the main, middle piece.  The left and right end pieces are laid on top of the long middle piece for support; slide inside or manually swivel like the picture shown. If you accidentally slide the end pieces too far outward, it will collapse.  So, make sure you have a long enough table for support as the pieces are not 'latched' to each other with anything.  For this reason, I gave it 3-stars.