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Security Features of Double Glazed Windows Contrary to old wooden frames modern double-glazed windows are equipped with security features to make it difficult for burglars to gain access to them. They have high-end handles and sturdy locking mechanisms. Espag handles have an auxiliary spindle in the back of the handle which controls the multi-point lock within the window frame. They are popular on modern uPVC windows and are available in straight or cranked versions. High-Tech Locking Mechanisms
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