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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 break into them. They have sturdy locking mechanisms as well as high-quality handles. Espag handles have a spindle on the back of the handle which is responsible for the multi-point lock inside the window frame. They are popular on contemporary uPVC windows and are available in cranked or straight variations. High-Tech Locking Mechanisms Window locks are an integral part of the security and safety of double-glaz
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