Halcyon’s Jack looks very much like an advanced child’s toy. On one end, it has a suction cup foot which will secure the Jack to almost any surface, at its top is a miniature windmill, and on its side are two arms with notched bars. The entire contraption is about 6 inches tall. The two arms extend if wind hits the propeller, and it is in this extension that the utility of the item becomes apparent. Placed between two iron bars in a portcullis, and with the wind of someone blowing on the propeller, the Jack has a 50% bend bars, lift gates.