The GSG Trellidor system is a fully framed retractable security grille which expands to secure the whole of an opening. The system is constructed with a galvanised steel trellis consisting of vertical uprights and horizontal 'flights' crossing a minimum of 3 verticals which allows the grille to expand and contract uniformly. The trellis is fitted into tracks at the top and bottom allowing the grille to slide open and closed. The system is locked using a single-throw, single key point mechanism with multi-point locking locations. Available trellidor options include, single sash, double sash, single flexi sash, double flexi sash or fixed sash. The system can be top hung, reveal or face fixed. Can be designed to fit any width of aperture.Trellidor grilles can be powder coated in a range of colours, see palette chart for more information.