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Security Features of Double Glazed Windows Contrary to old wooden frames modern double-glazed windows have added security features that make it difficult for burglars to open the windows. They have robust locking mechanisms and top-quality handles. Espag handles come with a spindle at the back that operates a multi-point lock on the window frame. These handles are very popular on uPVC windows. They are available in straight and cranked versions. High-Tech Locking Mechanisms Window lock