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Security Features of Double Glazed Windows Contrary to old wooden frames modern double-glazed windows come with security features to make it difficult for burglars to break into windows. They have sturdy locking mechanisms as well as high-quality handles. Espag handles are equipped with an auxiliary spindle in the back of the handle that is responsible for the multi-point lock inside the window frame. They are popular on modern uPVC windows and come in straight or cranked variations. High-Tech Locking Mech