Half Dome Mirror, 180 degree x 18 inches. Designed to provide better vision at T intersections. Should be fastened to wall or ceiling. If hanging is required, use a 360 degree Full Dome. Manufactured with 100% Virgin Grade Acrylic, using the latest technologies. Mirrors have enhanced optical quality, superior reflectivity are free of defects and distortions and contain UV inhibitors to prevent sunlight discoloration. Manufactured under environmentally friendly processes. Sold as Each.