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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 helps with energy efficiency. Window handles from Espag come with a spindle that is 7mm square that is inserted into the frame and is engaged by the multi-point locking system. They are available in cranked and in-line versions that can rotate either left or right. Espa