Securikey Heavy Duty Polycarbonate Half Dome Ceiling Security Surveillance Convex Mirror for Institutions. The half dome is ideal to be used in cells, day rooms, visitation areas, or any other area that requires wide area surveillance. It is also perfect at T-Junctions, eliminating blind spots around corners. This mirror is designed so that officers, warders & nurses are able to observe recreational rooms, larger cells, wards. The mirror is also used in T junction passageways in prisons, instituions & justice courts to prevent attacks, avoid collisions & surveillance of both passageways. Virtually indestructible & unbreakable, mirror quality polycarbonate face Rock resistant, Bullet resistant, resistant to repeated blows, Shattering Spalling Pure silver reflective coating Powder coated steel frame with unique tamper-proof design Recessed, tamper-proof fixings High heat resistance to 240 degrees Extra Wide Field of Vision Especially good for right angled passageways Brightest of reflection Easy to Install Ideal for surveillance by warders, nurses etc Can be used in conjunction with CCTV to enhance effectiveness & safety