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Choosing a Double Glazing Window Handle Window handles are available in many different styles. They are typically made of uPVC, but they can also be constructed out of wood or aluminium. They can be cockspurs, key locking or cranked. The most commonly used uPVC window handles are Espagnolette handles. They have an elongated spindle on the back, which is inserted into the gear box of the lock inside the window frame. UPVC When choosing an UPVC double glazing window handle, it's important to choose the right design and size for your windows