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Types of Double Glazed Windows Handles UPVC window handles play a crucial part in the process of double glazing. They are used to control the locking and seal the window which can improve energy efficiency. Espag window handles have seven millimeter square spindles that enters the frame to engage with the multi-point locking system. They are available in both the in-line and cranked versions that can rotate either left or right. Espag The most common type of window handle, Espag handles work with espagnolette locks and can be used on uPVC