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Choosing a Double Glazed Window Handle The proper double-glazed window handle will ensure that your windows are safe and energy efficient. You can replace old handles or install new ones to your windows at home. There are many types of handles. One is the cockspur handle. It 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 come in left and right variants. These han