Alert firefighters to the hazards associated with truss roof/floor assemblies with these highly reflective aluminum signs. Made with .080 mil thick engineer-grade, reflective aluminum that is corrosion-free and built to permanently withstand harsh elements. Great for both indoors and outdoors. Includes radius corners for safety. Safety signs are predrilled for fast and easy installation. Reflective intensity meets the Standard Specification of Roads and Bridges on Federal Highway Projects 1985 (FP85). Signs measure 6 x 12.