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Choosing a Double Glazed Window Handle The correct double-glazed window handle will keep your windows secure and energy efficient. You can change handles or install new ones to your home's windows. There are many different types of handles available that include cockspur handles which feature spurs that lock onto a wedge-shaped striker plate. In-line UPVC handles are straight and pivot left or right, whereas the cranked handles come in left and right variations. These handles are designed to work with