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Types of Double Glazed Windows Handles UPVC window handles play an important part in the double glazing process. They are used to control locking and seal the window which can improve energy efficiency. Window handles made by Espag have a 7mm square spindle that connects to the frame with the multi-point locking system. They are available in Cranked and in-line versions that can rotate either left or right. Espag Espag handles, the most well-known window handle type are a good choice for espagnolette locks
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