A Portable, Hand Carried Folding (Collapsible) Warning Line System For Asphalt or Metal Roofs Complies with OSHA’s (Std-29 CFR)(1926.502) (f) Quick set up Priced per stand Recommended spacing: Every 50 ft. 34 lbs. per stand Uses: Rooftops, construction sites, parking lots, high rise construction, manufacturing facilities, maintenance contractors, office buildings, amusement parks, airports, warehouses ...