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Choosing a Double Glazing Window Handle Window handles are available in many different styles. They are typically uPVC but they can also be made of aluminium or timber. They can be cockspurs, key locking or cranked. Espagnolette handles are the most common kind of uPVC window handle. They have a square spindle on the back that goes into the gearbox of the lock within the window frame. UPVC It is essential to choose the proper size and design of UPVC double-glazing window handles to your windows. It is wor