Help prevent theft and increase work place safety with this security mirror. Scan unguarded aisles, eliminate blind intersections, monitor production areas and safeguard entrances and exists. Detection mirrors are curved to eliminate distortion. This adjustable, convex glass security mirror has a 160° view angle, making it ideal for scanning any business or office. For easy installation, all mirrors come with heavy-duty mounting brackets. Circular. Diameter: 18"; For Area: 15 sq ft; Shape: Circular; Material(s): Glass.