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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 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 which feature a spur that locks onto the striker plate in the shape of a wedge. In-line UPVC handles are straight and can be turned either left or right. come in left and right variations. These ha