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Choosing a Double Glazed Window Handle Double-glazed windows that have the right handle will be more secure 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 is the cockspur handle. It is a spur that snaps onto the striker in the shape of a wedge. In-line UPVC handles are straight and can be turned left or right, whereas Cranked handles are available in left and right variations. These handles are compatible with multipoint