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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 helps with energy efficiency. Window handles made by Espag have seven millimeter square spindles that 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 are a good choice for espag