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Security Features of Double Glazed Windows Modern double-glazed frames have additional security features that make it harder for burglars to open them. They include strong locking mechanisms and high-quality handles. Espag handles come with a spindle on the back of the handle that is responsible for the multi-point lock inside the window frame. They are common on contemporary uPVC windows and are available in straight or cranked variations. High-Tech Locking Mechanisms Window locks are an integral componen