Vernon Library Supplies offers an easy, cost-effective way to help prevent theft in your Library, School or Office with these Convex Detection Mirrors. They are the first line of defense against shoplifting and pilferage. Security mirrors increase aisle visibility and eliminate blind spots. They are also excellent as safety mirrors to prevent accidents. Our mirrors are lightweight, fade-proof and unbreakable with top-quality silvering and near-perfect convexing which affords the widest angle of vision.