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Choosing a Double Glazed Window Handle Double glazed windows that have the right handle will be more secure and energy efficient. You can change handles or install new ones for your home's windows. There are many different types of handles that are available that include cockspur handles which feature a spur that locks onto an elongated striker plate. In-line UPVC handles are straight and can be turned left or right, whereas the cranked handles come in left and right variations. These handles are used