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Security Features of Double Glazed Windows Modern double-glazed frames come with additional security features that make it harder for burglars open them. They have sturdy locking mechanisms as well as high-quality handles. Espag handles have a spindle at the back of the handle that controls the multi-point lock within the window frame. These handles are very popular on uPVC windows. They are available in straight and cranked versions. High-Tech Locking Mechanisms Window locks are an essential part of the security and security of double-glazed
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