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Security Features of Double Glazed Windows Modern double-glazed frames are equipped with additional security features that make it more difficult for burglars to open them. They have high-end handles and robust locking mechanisms. Espag handles are equipped with a spindle at the back of the handle that operates the multi-point lock in the window frame. They are popular on modern uPVC windows and come in straight or cranked versions. High-Tech Locking Mechanisms Window locks are an in