Aluminum Property & Grounds Security Signs from School Fix® are designed specifically for directing school visitors and clearly displaying safety and security concerns that surround every school. These signs help create more of a campus environment, by coordinating messages. Quality and durable construction, signs are .063” or .080” thick commercial grade aluminum. These signs have integrated U.V. inhibitors to resist fading and stay looking new. Each sign has 5/16” pre-drilled holes for a hassle-free installation.