The CRL Safety Boot Guard Rail System is a reusable base for constructing freestanding temporary guard rail and stair rail systems that exceed OSHA standards. All you add are the fasteners and your own 2 by 4's. The CRL Safety Boot needs no bracing, and anchors into most materials, including concrete. Two 2 by 4's inserted into the center to form a strong, rigid post design. Toe boards need no fasteners, and drop directly into the channels on each Safety Boot. When permanent rails are ready-to-install, the Boots can be easily removed and reused in another location. Safety Boots are molded in one piece from a durable, high-impact, safety yellow polymer, and have a one-year replacement guarantee. Easy to read instructions in both English and Spanish are included. Test data comes with each system, certified and signed by a professional engineer, ready for review by OSHA inspectors. Includes four metal washers.