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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 gain access to them. They have sturdy locking mechanisms as well as high-quality handles. Espag handles come with a spindle at the back that triggers a multi-point lock that is attached to the window frame. They are common on contemporary uPVC windows and come in straight or cranked versions. High-Tech Locking Mechanisms Window locks are