Abstract: A security system for protecting building openings with an iron work assembly for protecting the opening against unauthorized entries. The iron work assembly includes first and second portions that are rigidly mounted to each other along an abutting edge and the other portion is releasably mounted to the building. The portion that is releasable mounted to the building is of sufficient dimensions to permit a person through. A threaded positional rod has two sections joined to each other and they can be selectively maintained either coaxially with respect to each other or at another predetermined angle. A third headed section is coaxially and telescopically threaded to one of the two sections. A user keeps the sections at an angle when it wants to keep the security system locked and coaxially aligns them when the user wants to release it.