Mr. Chain Reflective Stanchions are a cost-effective crowd control solution for indoor or outdoor events. Each stanchion is 41-in tall with a 16-in hollow base that can be filled with sand for added stability. A c-hook on the top of each stanchion allows you to easily attach plastic chain not included. Ideal for protecting people and property at events, construction sites, and more by forming lines, directing crowds, or restricting access. Made of high-density polyethylene with UV inhibitors.