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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 replace old handles or install new ones to the windows in your home. There are many types of handles. One of them is the cockspur handle. It has a spur that locks onto the striker in the shape of a wedge. In-line UPVC handles are straight and can be turned left or right, whereas cranked ones come in left and right versions. These handles are compatible with multipoi