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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 open them. These include robust locking mechanisms and top-quality handles. Espag handles have a spindle at the back of the handle that is responsible for the multi-point lock inside the window frame. They are common on contemporary uPVC windows and are available in cranked or straight variations. High-Tech Locking Mechanisms Window locks are a crucial component of the security and security