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Choosing a Double Glazed Window Handle The correct double-glazed window handle will ensure your windows are secure and energy efficient. can change handles or install new ones to your home's windows. There are a variety of handles. One of them is the cockspur handle, which is a spur that snaps onto the striker in the shape of a wedge. In-line UPVC handles are straight and can be turned either left or right. Cranked handles come in right and left versions. These handles are compatible with