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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 old handles on your window. There are many types of handles. One is the cockspur handle, which is a spur that snaps onto a wedge-shaped striker. In-line UPVC handles are straight and can be turned left or right. Cranked handles come in both left and right versions. These handles are used with multipoint locks to provide security. Easy to