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Choosing a Double Glazed Window Handle Double glazed windows that have the right handle will be more secure and efficient in energy use. You can put in new handles or replace the old handles on your window. There are a variety of handles available, including cockspur handles, which have a spur that locks onto the striker plate in the shape of a wedge. In-line UPVC handles are straight and can be turned right or left. Cranked handles come in left and right variants. These handles are used with multi