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Security Features of Double Glazed Windows Modern double-glazed frames are equipped with additional security features that make it harder for burglars open them. They have strong locking mechanisms and high-quality handles. Espag handles have spindles on their back that is used to operate a multi-point lock that is attached to the window frame. These handles are very popular on uPVC windows. They come in cranked and straight versions. High-Tech Locking Mechanisms W
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