See All PV18-180 Panaramic Full Dome Plexiglas Security Mirror, 180 Degree Viewing Angle, 18" Diameter (Pack of 1) Half dome mirror helps a person see around obstacles for safety, or monitor a wide area for efficient surveillance Mounts on a wall and reflects a 180 degree angle image for an overhead view of 3-way intersections Acrylic is shatter resistant, weighs less than glass, and reflects a clear, bright image Comes with wall-mounting hardware for convenient installation