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Choosing a Double Glazed Window Handle The correct double-glazed window handle will ensure that your windows are safe and energy efficient. You can replace the handles or install new ones for the windows in your home. There are a variety of handles. One is the cockspur handle. It has a spur that locks onto an elongated striker. In-line UPVC handles are straight and can be turned right or left. Cranked handles come in left and right variations. These handles are compatible with multipoint locks to offer secu