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Types of Double Glazed Windows Handles UPVC window handles play a vital role in the double glazing process. They are used to control locking and seal the window, which improves energy efficiency. Window handles of Espag are fitted with a spindle that is 7mm square that is placed into the frame and engages the multi-point locking system. Both inline and cranked versions are available, which can be turned either left or right. Espag Espag handles, the most well-known window handle are a good choice for espag