Keep employees and customers aware of important announcements and reminders on a variety of machinery and metal surfaces using DURABLE DURAFRAME Security Magnetic Sign Holders. Each holder has a hinged opening for easy removal and insertion of messages. Dual-colored magnetic frames are ideal for all types of safety and warning information. Made from anti-glare plastic. Cover pulls back easily for quick insert updates. Attaches to metallic surfaces such as whiteboards, metal cabinets, racking and machinery. 4-sided frame can be viewed horizontally or vertically.