National Marker Company Sign with DANGER - LIFELINE MUST BE HOOKED UP WHILE ON PLATFORM Sign is designed to be placed across the personal property, corridors, working premises or the stairways with potential risks. It is placed as a part of safety-related signage. The OSHA danger sign is manufactured with high-grade material that boosts the durability; this makes it suitable to be used indoors and outdoors. The text is clear and simple, legible even from a certain distance. The signage has a crystal clear coating of Sign Muscle that increases the visibility and protects the sign from fading, and other and environmental damage.