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Types of Double Glazed Windows Handles UPVC window handles play a vital role in the process of double glazing. They are used to control locking and seal the window, which improves energy efficiency. Window handles from Espag feature 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 commonly used type of window handle Espag handles are able to use espagnolette locks. They c
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