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Choosing a Double Glazed Window Handle Double-glazed windows with the correct handle will be more secure and efficient in energy use. You can replace old handles or install new ones to your home's windows. There are many types of handles. One is the cockspur handle. It is a spur that snaps on to the striker in the shape of a wedge. In-line UPVC handles are straight and can be turned right or left. Cranked handles are available in left and right versions. These handles are designed to