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Choosing a Double Glazed Window Handle The right double glazed window handle will keep your windows secure and energy efficient. You can install new handles or replace old ones on your home's window. There are a variety of handles. One of them is the cockspur handle, which has a spur that locks on to an elongated striker. In-line UPVC handle are straight and can be turned left or right. Cranked handles come in right and left variants. These handles are designed to work with multipoint lock systems. Easy to u