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Choosing a Double Glazed Window Handle The right double glazed window handle will ensure your windows are secure and energy efficient. You can install new handles or replace older ones on your windows in your home. There are a variety of handles to choose from that include cockspur handles with a spur that locks onto a wedge-shaped striker plate. In-line UPVC handles are straight and turn left or right, whereas the cranked handles come in left and right variations. These handles are designed to work with mul