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Security Features of Double Glazed Windows In contrast to wooden frames of the past, modern double-glazed windows come with security features to make it difficult for burglars to open windows. They have strong locking mechanisms and high-quality handles. Espag handles are equipped with a spindle at the back of the handle that controls the multi-point lock within the window frame. They are common on modern uPVC windows and are available in cranked or straight variations. High-Tech Locking Mechanisms Window lock
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