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