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Choosing a Double Glazing Window Handle Window handles come in a variety of styles. They are typically uPVC however they can also be aluminum or wood. They can be cranked, key locking or cockspur. Espagnolette handles are the most popular type of uPVC window handle. They feature an elongated spindle on the back that is connected to the gear box of the lock within the window frame. UPVC When choosing an UPVC double glazing window handle, it is important to choose the correct style and size for your win