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Types of Double Glazed Windows Handles UPVC window handles are a key component of the double glazing process. They are used to control the locking and seal the window which improves energy efficiency. Espag window handles have a 7mm square spindle which connects to the frame with the multi point locking system. They are available in cranked and in-line versions that can be turned left or right. Espag Espag handles, the most common window handle type can be used with espagnolette locks on uPVC windows, alumin