Internal steel stiffeners lengthen the complete door width to make certain B18, B16 and B14 Sequence flush doors meet architectural requirements and business requirements for whole flush and steel-stiffened doors. Also, steel windows may be Outfitted with multi-place locking systems and affect-resistant glass for Increased protection and security against intruders https://www.whosampled.com/user/Euroline-Steel-Windows-And-Doors/