Single Diamond Grilles are mostly used for security and privacy purposes on laundry and bathroom windows. They are also installed on side glass section of front door as side lights. Oz Roller Shutter Grilles are made with 70 mm door frames to provide extra strength. 37 mm window frames are only used in case of limited spaces. Single Diamond Grilles are fixed to the window with concealed screws. If the window is an awning window, the grille is fixed to the moving part of the window. The window can still be opened in this way. DVA(Privacy mesh) can be added to the grilles for an extra cost of $75 per square meter. Minimum of 1 square meter is charged for the grilles.