Perimeter Warning Line System with Flags fully conforms to all OSHA regulations and requirements when properly set up. One system covers 100 linear feet, and comes with four base sections and 100 feet of bright red plastic pennant flags. Each set weighs 150Lbs. Its Important Features: Stanchions are 44" high so that the sag of the line between stanchions is no less than 40" Exceeds OSHA 200# knock-over requirement "X"-style base unfolds for quick & easy set-up Locking base pin secures stanchion to base Folds compactly into two cartons for shipping & storage Multiple sets may be put together to cover large areas (consult local regulations for monitor requirements) Perimeter Warning Lines are generally an OSHA requirement in many roofing and general construction applications. Check with your state codes, but Perimeter Warning Lines are usually required within 7' of the edge of roofing systems and any heights over 7' high, openings, stairways, to partition off hazardous operating equipment (like kettles), etc.