Quik Lok QLX-21 Keyboard stands and displays Quik Lok's new line of stands represents a major breakthrough in "X" stand design by incorporating the "QLX RECALL" locking disc system By integrating the "Original Quik Lok" locking disc, this new patented design features two important modes of operation: Recall Mode- allows the user to choose one of four height positions as a preset and have the stand return to that height every time the stand is opened. Transport Mode- enables the stand to be locked closed to prevent it from opening accidentally. When the stand is folded, move Position Pin to the "T" hole. The stand is now firmly locked in closed position