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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 put in new handles or replace the old handles on your window. 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 are available in right and left versions. These handles are compatible with multipoint locks to provide