Hengjiu chain is used in major theatrical stage equipment like lifters in the National Stadium (Bird's Nest) for the 2008 Beijing Olympic Games for its reliability. The lifter can achieve several times faster speed than conventional hydraulic lifter in transmitting lift thrust and stability. It combines well in the lifter design to achieve high speed lifting, high frequency operation, high durability, high accurate stop at multiple positioning, clean, energy saving, and low noise.