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Types of Double Glazed Windows Handles UPVC window handles are an essential component of the double glazing process. They are used to control locking and seal the window which improves energy efficiency. Espag window handles are equipped with a spindle made of 7mm square, which is put into the frame. It then engages the multi-point locking system. Both inline and cranked versions are available that can be turned either left or right. Espag The most popular type of window handle Espag handles are able to be