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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 helps with energy efficiency. Espag window handles have a 7mm square spindle that is inserted into the frame to work with the multi point locking system. Inline and cranked versions are available, which can be turned left or right. Espag Espag handles, the most well-known window handle type ar