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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 install new handles or replace old ones on your home's window. There are a variety of handles. One is the cockspur handle. It has a spur that locks onto an elongated striker. In-line UPVC handles are straight and turn left or right, whereas the cranked handles come in left and right variations. These handles are used with multipoint locks to provide security. Easy t