Caution sign follows OSHA signs guidelines for signal word and message text format (size, color, etc.) per OSHA CFR 29 Part 1926.200 and 1910.145 regulations. PPE sign indicates requirements for construction hat, eye protection, and safety shoes in a designated area. Personal protective equipment sign is made of .0320" thick rigid white aluminum. Surface printed with UV inks and "anti-graffiti" UV top coating. Includes a 3/16" (5.0mm) mount hole in each corner. Safety signs designed for medium-duty indoor/outdoor industrial-strength rigid signage applications, impact resistant, able to withstand harsh environments including service temperature range of -40˚F to +450˚F. Up to 10-year substrate outdoor durability depending on preparation, application, geographic area and exposure conditions. Caution sign follows OSHA signs guidelines for signal word and message text format (size, color, etc.) per OSHA CFR 29 Part 1926.200 and 1910.145 regulations.