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Security Features of Double Glazed Windows Modern double-glazed frames have additional security features that make it difficult for burglars open them. These include high-quality handles as well as strong locking mechanisms. Espag handles have an auxiliary spindle in the back of the handle that controls the multi-point lock within the window frame. are extremely popular on uPVC windows. They are available in cranked and straight versions. High-Tech Locking Mechanisms Window locks are a vital part of t