A surveillance security mirror is perfect for monitoring areas and work great in corners, exits and ceilings. Security mirrors help you watch blind spots and you can scan aisles easily to protect your assets. The mirrors come in either dome or convex style and are made out of shatterproof glass or acrylic. When deciding on what size mirror you need, use this general rule of thumb, one inch in diameter equals about one foot of coverage. For example, if you want to cover 20 feet, a 20” diameter mirror would be perfect. The styles of the security mirror are either a dome or convex style. Both offer superior protection. The dome can give you 360 degrees, 180 degrees or 90 degrees of coverage while the convex give you 160 degrees of coverage.