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Security Features of Double Glazed Windows Unlike old wooden frames, modern double-glazed windows have added security features to make it difficult for burglars to break into windows. These include high-quality handles and robust locking mechanisms. Espag handles come with a spindle on the back of the handle which operates the multi-point lock in the window frame. are popular on modern uPVC windows and come in straight or cranked versions. High-Tech Locking Mechanisms Window locks are an integral comp