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Types of Double Glazed Windows Handles UPVC window handles play a crucial part in the double glazing process. They are used to control the locking of the window and ensure it seals properly, helping to improve the efficiency of energy. Espag window handles have a 7mm square spindle which connects to the frame with the multi-point locking system. They are available both cranked and in-line versions that can be turned left or right. Espag The most common kind of window handle Es
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