Invisible Balcony Grill: Invisible grilles are a sophisticated alternative to the typically unsightly iron bar grilles erected over balconies, windows, and staircases. They are made from 316 Stainless Steel wire and are fastened and tightened into the walls. The wire's tension prevents it from bending under stress, making it as safe as iron grilles without sacrificing visual appeal. https://casacreativa.com.sg/openable-sliding-invisible-balcony-window-grille-price-singapore/