Horizontal Flex Bar. The name may mislead you. The true advantage of this device is that it may be angled upward while the jaws stay in a horizontal position. This can gain 8 – 10 inches (20 – 25cm) of height in the positioning of the ring often all that is needed in procedures on the obese patient. The device has also been adjusted to hold the solid and segmented rings in the Mini Bookler Systems.