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Security Features of Double Glazed Windows In contrast to wooden frames of the past, modern double-glazed windows have added security features that make it difficult for burglars to open them. They have sturdy locking mechanisms as well as high-quality handles. Espag handles are equipped with a spindle at the back of the handle which operates the multi-point lock in the window frame. They are extremely popular on uPVC windows. They come in straight and cranked versions. High-Tec