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Choosing a Double Glazing Window Handle Window handles are available in many different styles. They are typically uPVC however they can also be aluminum or timber. They can be locked with keys, cranked or cockspur. The most commonly used uPVC window handles are Espagnolette handles. They feature an elongated spindle on the back that goes into the gear box of the lock inside the window frame. UPVC When selecting a UPVC double glazing window handle, it's important to choose the right style and size for your wind