Widely used in hospital psychiatric wards, prisons & police stations. Prevents surprise attacks or collisions. Ensures staff, patient and inmate safety. 3mm Shatterproof Polycarbonate face withstands repeated blows. High heat resistance (240-degrees). Rigid steel mounting ring bolts to ceiling – preventing removal. High density foam insert included for increased strength. Vacuum metalised coating – Gives the brightest sharpest reflection