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Security Features of Double Glazed Windows Modern double-glazed frames come with additional security features that make it harder for burglars to open them. They have robust locking mechanisms and top-quality handles. Espag handles come with an auxiliary spindle in the back of the handle which controls the multi-point lock within the window frame. These handles are very popular on uPVC windows. They are available in cranked and straight versions. High-Tech Locking Mechanisms Window locks are a vital element of the security and safety of d