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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 the locking of the window and ensure that it is sealed properly, which helps to improve the efficiency of energy. Window handles from Espag come with a spindle of 7mm square, which is inserted into the frame and engages the multi-point locking system. Both inline and cranked versions are available and can be turned either left or right. Espag The most commonly used ty