Column Sentry provides the most complete impact protection available to fully protect your investments your facility, your equipment and your people. Column Sentry Protectors absorb impacts repeatedly by surrounding your columns with a unique cushion of air. The air vent system allows air to escape during impact, allowing the column to absorb impact and continually return to its original form. Column Sentry Protectors are very easy to install, no tools are required, simply fasten the straps. Moulded from high impact polyethylene.