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Security Features of Double Glazed Windows Unlike old wooden frames, modern double-glazed windows come with security features to make it difficult for burglars to gain access to them. These include high-quality handles as well as strong locking mechanisms. Espag handles come with a spindle on the back of the handle which is responsible for the multi-point lock inside the window frame. They are common on modern uPVC windows and come in cranked or straight variations. High-Tech Locking Mechanisms Window locks