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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 the locking and seal the window which helps with energy efficiency. Window handles of Espag are fitted with a spindle that is 7mm square that is put into the frame and engages the multi-point locking system. They are available both cranked and in-line versions that can be turned left or right. Espag Espag handles, the most common window handle, can be used with espagno
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