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Security Features of Double Glazed Windows Modern double-glazed frames come with additional security features that make it difficult for burglars to open them. They include sturdy locking mechanisms as well as high-quality handles. Espag handles feature a spindle at the back that triggers a multi-point lock that is attached to the window frame. They are common on modern uPVC windows and are available in cranked or straight variations. High-Tech Locking Mechanisms Window lo
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