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Choosing a Double Glazing Window Handle Window handles are available in a variety of styles. They are usually made of uPVC however, they can also be constructed from wood or aluminum. They can be cranked, key locking or cockspur. Espagnolette handles are the most common kind of uPVC window handle. They feature a square spindle on the back, which is connected to the gearbox of the lock within the window frame. UPVC When choosing a UPVC double glazing window handle, it is important to choose the right style and si