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Choosing a Double Glazed Window Handle The correct double-glazed window handle will ensure that your windows are safe and energy efficient. You can change handles or install new ones to your home's windows. There are a variety of handles that are available, including cockspur handles, which have a spur that locks onto a wedge-shaped striker plate. In-line UPVC handles are straight and pivot left or right, whereas cranked ones come in right and left versions. These handles are compatible