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Choosing a Double Glazing Window Handle Window handles are available in different styles. They are usually made of uPVC however, they can also be constructed from aluminium or wood. They can be cockspurs, key locking, or cranked. The most commonly used uPVC window handles are Espagnolette handles. They feature an elongated spindle on the back which goes into the gearbox of the lock inside the window frame. UPVC When choosing a UPVC double glazing window handle, it is important to choose the right style and s