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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 to break into them. These include high-quality handles and sturdy locking mechanisms. Espag handles feature a spindle at the back that is used to operate a multi-point lock on the window frame. They are extremely popular on uPVC windows. They are available in straight and cranked versions. High-Tech Locking Mechanisms Window locks are an in