This 7 ft. Safety Guard Rail system is used for safety and security on exterior scaffolding structures. A convenient wedge clamp on the support is easy to install by locking onto the attached scaffold frame. A minimum of 2 guard rails (upper and mid rail) must be installed on each side of the scaffold. Guard rails must be installed along the perimeter of all scaffold structures of a height of 10 ft. or more to prevent accidental falls.