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Choosing a Double Glazed Window Handle Double-glazed windows with the correct handle will be more secure and energy efficient. You can change handles or install new ones to the windows in your home. There are a variety of handles. One of them is the cockspur handle, which is a spur that snaps onto the striker in the shape of a wedge. In-line UPVC handle are straight and can be turned right or left. Cranked handles are available in right and left versions. These handles are designed to work with multipoint l