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Types of Double Glazed Windows Handles UPVC window handles are an essential part of the double glazing process. They are used to control the locking of the window and ensure it seals properly, helping to improve the efficiency of energy. 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, which can be turned left or right. Espag The most popular kind of window handle Espag handl