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Choosing a Double Glazed Window Handle Double-glazed windows with the right handle will be more secure and energy efficient. You can replace the handles or install new ones for your windows at home. There are many different types of handles available such as cockspur handles with a spur that locks onto an elongated striker plate. In-line UPVC handles are straight and pivot left or right, while the cranked handles come in right and left versions. These handles are used with multipoint locks to offer securi