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Types of Double Glazed Windows Handles UPVC window handles play a vital role in the process of double glazing. They are used to control the locking and seal the window, which can improve energy efficiency. Window handles of Espag are fitted with a spindle made of 7mm square that is placed into the frame and engages the multi-point locking system. Both cranked and inline versions are available, which can be turned right or left. Espag The most common kind of window handle Espag handles are able to work with espagnolette locks and can be used on uPVC,
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