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Security Features of Double Glazed Windows In contrast to wooden frames of the past, modern double-glazed windows are equipped with security features to make it difficult for burglars to gain access to them. These include high-quality handles and robust locking mechanisms. Espag handles have a spindle on the back of the handle which controls the multi-point lock within the window frame. These handles are very popular on uPVC windows. They come in cranked and straight versions. High-Tech Locking Mechanism