See All N30 Circular Glass Indoor Convex Security Mirror, 30" Diameter (Pack of 1) Circular convex mirror reflects a wide angle image at a diminished size to extend a field of view Helps a person see around obstacles for safety, or monitor a wide area for efficient surveillance Glass is scratch resistant, withstands frequent cleaning, and reflects a clear, bright image Tempered hardboard backing for good strength-to-weight ratio in indoor applications Comes with a swivel mounting bracket that makes the mirror adjustable to a wide range of angles