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Security Features of Double Glazed Windows Modern double-glazed frames come with additional security features that make it more difficult for burglars open them. These include high-quality handles as well as robust locking mechanisms. Espag handles have spindles on their back that is used to operate a multi-point lock that is attached to the window frame. They are common on modern uPVC windows and come in straight or cranked versions. High-Tech Locking Mechanisms Window locks are a crucial element of the se