The NMC C31AB 10x14 caution sign clearly warns of hard hat requirements in areas with potential hazards. Built from .040 aluminum with baked-on enamel, it delivers exceptional durability and corrosion resistance for long-term use indoors or outdoors. Its Sign Muscle™ protective coating enhances color clarity, blocks UV damage, and allows for quick graffiti cleanup. Designed with rounded corners and pre-drilled holes for easy mounting, this safety sign meets demanding environmental conditions, enduring temperatures from -40° to 250°F. A reliable choice for maintaining workplace safety and compliance.