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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 many types of handles. One of them is the cockspur handle. It has a spur that is locked on to the striker in the shape of a wedge. In-line UPVC handles are straight and can be turned left or right. Cranked handles are available in both left and right variants. These
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