The See All round rectangular acrylic outdoor convex security mirror is a rectangular convex glass mirror with two rounded sides that reflects a wide angle image at a diminished size to extend a field of view to help a person see around obstacles for safety, or monitor a wide area for efficient surveillance. The rounded rectangular shape fits in smaller places than circular mirrors, while providing the same wide angle view. Also, when mounted horizontally, it reflects less glare from the sun or overhead lighting. Acrylic is shatter resistant, weighs less than glass, and reflects a clear, bright image. The mirror comes with mounting hardware that makes the mirror angle adjustable after installation. It has an ABS (acrylonitrile butadiene styrene) backing for resistance to impact and wear, with a vinyl-coated aluminum edge for weather resistance in outdoor applications. Width is measured from the widest points on the rounded sides. SpecificationsModelSize and CoverageMounting Hardware IncludedPLXO121812 x 18", covers areas up to 15 ft.Single bracketPLXO152415 x 24", covers areas up to 20 ft.Dual bracketsPLXO203020 x 30", covers areas up to 25 ft.Dual bracketsPLXO243624 x 36", covers areas up to 35 ft.Dual bracketsMirrors installed with a single bracket can be adjusted to almost any angle. Mirrors installed with dual brackets can be adjusted to a wide range of angles along one axis. Safety mirrors are used to help increase visibility in a variety of locations; for example, in hallway intersections and sharp turns, and in driveways and loading docks where drivers have to back up or enter traffic. Safety mirrors are sometimes called security mirrors, and they can be used to extend the view of security personnel, or to help monitor factory workers and automated processes to improve quality control and productivity. For convex mirrors, objects will appear to be further away than they are, and will be easier to see in a larger mirror