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Choosing a Double Glazing Window Handle Window handles come in different styles. They are usually uPVC however they can also be aluminum or timber. They can be cranked, key locking or cockspur. Espagnolette handles are the most common type of uPVC window handles. They have a square spindle at the back that goes into the gear box of the lock inside the window frame. When choosing an UPVC double glazing window handle, it's important to choose the correct style and size for your windows. Many manufacture