DURABLE ALUMINUM: 'Do Not Block This Gate' signs are made using 80 mil thick non-reflective aluminum and do not bend easily. They have been proven to outlast the toughest of storms. Signs last over 10 years outside. EASY INSTALLATION: All signs come with rounded, burr-free corners and 3/8 inch punched and pre-cleared holes. Signs mount to U-channel posts, square or round galvanized posts, wooden posts, and chain-link fences. LAMINATED FOR PROTECTION: With lamination, graphics are protected from weather and abuse to preserve a fresh look. Graffiti can be cleaned off too. Clear UV laminate resists chemicals, UV rays, water, and abrasion. OSHA COMPLIANCE: Safeguard your workplace from accidents and liabilities by placing our high-quality signs that follow OSHA regulations. These are universally recognizable and encourage safe work practices. PACK CONTENTS: One 24 x 18 inch blue, black and white aluminum sign.