Used Guard rails are ideal for protecting pedestrian walkways, loading docks, production/shipping areas, assembly lines, and mezzanines. Guard rails are made of heavy duty steel and are secured to the floor for added stability. Used guard rails from ASI come in a single post, double post, or rail style. They are an effective and inexpensive way to protect employees, work areas, and equipment. To protect columns, see column protectors or column guards, depending on your specific material handling needs.