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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 put in new handles or replace the old handles on your window. There are many types of handles. One is the cockspur handle, which is a spur that snaps onto an elongated striker. In-line UPVC handles are straight and can be turned left or right, while cranked ones come in left and right variations. These handles are used with multipoint locks to provide security. Easy to ope