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Choosing a Double Glazed Window Handle The right double glazed window handle will keep your windows secure and energy efficient. You can replace old handles or install new ones to the windows in your home. There are a variety of handles that are available that include cockspur handles which have a spur that locks onto the striker plate in the shape of a wedge. In-line UPVC handles are straight and can be turned left or right, while the cranked handles come in left and right versions. These handles are de