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Types of Double Glazed Windows Handles UPVC window handles are an essential part of the double glazing process. They are used to control locking and seal the window, which can improve energy efficiency. Espag window handles are equipped with a spindle of 7mm square, which is put into the frame and is engaged by the multi-point locking system. They are available both the in-line and cranked versions that can be turned left or right. Espag Espag handles, the most well-known window handle, can be used with
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