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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 the locking of the window, and also ensure it seals properly, helping in energy efficiency. Espag window handles have a 7mm square spindle that is inserted into the frame to work with the multi-point locking system. They are available both Cranked and in-line versions that can turn either left or right. Espag Espag handles, the most well-known window handle type, can be u