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Security Features of Double Glazed Windows Modern double-glazed frames are equipped with additional security features that make it difficult for burglars open them. These include high-quality handles as well as robust locking mechanisms. Espag handles feature spindles on their back that operates a multi-point lock that is attached to 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 a vital
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