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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 install new handles or replace the old ones on your home's window. There are a variety of handles that are available, including cockspur handles, which have spurs that are locked onto an elongated striker plate. In-line UPVC handles are straight and can be turned left or right, whereas the cranked handles come in left and right versions. These handles are u