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Types of uPVC Windows Handles If a window handle lock fails, it is time-consuming to find a replacement that matches the existing mechanism. The first thing to know is the kind of handle you have. Then you need to know the step height, which is the distance from the nose of the handle to the frame or base where it is installed. Also, you need to know if there's a handing. Espag Espag is the name for handles that is installed on uPVC windows and doors. Th