This Securistyle Defender top hung window friction hinge has a built in restrictor and a stack height of 13mm.  The window restrictor incorporates a child resistant mechanism which limits the initial opening of the window in question.  The built in quick release lever allows the window to be fully opened to be easily cleaned.
- Built in child resistant mechanism limits initial opening
- Built in quick release lever allows the window to be fully open for easy cleaning
- Restrictor automatically relocates and resets when the window is closed