Signs identify and indicate the potential, type, and degree of hazards that may lead to accidental injury or property damage. ? They comply in accordance with OSHA 29 CFR 1910. 145 and ANSI Z535 requirements. Thick rigid aluminum has the strength of metal without the rust. Printed surface is protected by UV protective coating to withstand splashes, wash-downs, and outdoor conditions, plus abrasion and chemical resistance. Rounded corners and 3/16" mounting holes are included for installation.