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Our 7x17 Hard Hats Must Be Worn in This Area with Hard Hat Pictogram Notice Sign enforces PPE compliance. Made from .040 polystyrene plastic, this sign withstands moisture and weather, suitable for indoor and outdoor environments. The bold text and pictogram require hard hats, enhancing worker safety. Featuring pre-drilled holes and rounded corners, this sign is great for larger construction zones, factories, or industrial sites.