"The 12’ Guardian Folding Door Dock Gate instantly alerts workers to open loading docks, bays, mezzanines and other exposed ledges with its high-visibility yellow paint and dual folding gates. This dock door gate has steel columns and a strong yet lightweight aluminum folding gate design that is counterbalanced with gas struts on either side for single hand use. The dock gate is OSHA-compliant with regards to height, and are capable of withstanding at least 200 lbs. of force. The top edges of the rails are at least 42"" H and do not deflect to a height of 39"" or less."