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Types of Double Glazed Windows Handles UPVC window handles play an important part in the double glazing process. They are used to control locking and seal the window which can improve energy efficiency. Espag window handles have seven millimeter square spindles that is inserted into the frame to work with the multi-point locking system. Both cranked and inline versions are available and can be turned left or right. Espag The most common type of window handle, Espag handles work with espagnolette locks and ca