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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 a variety of handles to choose from such as cockspur handles with a spur that locks onto the striker plate in the shape of a wedge. In-line UPVC handle are straight and can be turned left or right. Cranked handles are available in both left and right variations. These handles are designed to work with mult