OSHA compliant design: Dock door safety gates feature 42" rail height that resists deflection below 39" ; withstands up to 200 lbs. of force to support warehouse compliance efforts Smooth one-handed operation: Counterbalanced gas struts on both sides allow controlled raising and lowering; dock door safety barrier helps maintain workflow efficiency Sized for wide dock openings: Measures 12" W x 5.75" D x 42" H lowered and 113.5" H raised; dock gates designed for indoor warehouse applications and easy installation Enhanced protection: Dual folding warehouse dock gates create a physical barrier for open loading docks and bays; high-visibility yellow finish alerts workers to exposed edges Durable steel and aluminum build: Steel support columns paired with lightweight aluminum folding dock door gate construction; engineered for strength without adding excess weight; pre-drilled mounting holes and hardware included; assembly required 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.