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Choosing a Double Glazed Window Handle Double glazed windows that have the correct handle will be more secure and energy-efficient. You can put in new handles or replace old ones on your home's window. There are many types of handles. One of them is the cockspur handle, which has a spur that locks on to the striker in the shape of a wedge. In-line UPVC handles are straight and pivot left or right, while cranked ones com