DURABLE ALUMINUM. Signs are made from heavy-duty, 40 mil thick aluminum. Unlike steel signs, our aluminum signs do not rust. Signs last up to 7 years outside. ROUNDED CORNERS. Signs have rounded corners and burr-free corners for safe handling, longer life and a professional appearance. LAMINATED. Graphics are protected from weather and abuse. Graffiti can be cleaned off. Laminated signs outlast competitive unlaminated or overcoated signs. EASY TO INSTALL. Signs have pre-punched/pre-cleared holes for installation. Mount with screws, nails, tie-wraps or wires. Sign attachment accessories are not included. GIVE A MESSAGE. Keep unauthorized employees out by installing This Area Closed Off sign.