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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 locking and seal the window which improves energy efficiency. Espag window handles are equipped with a spindle that is 7mm square that is inserted into the frame. It then engages the multi-point locking system. They are available in both the in-line and cranked versions that can be turned left or right. Espag Espag handles, the most popular window handle are a good choice fo