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Choosing a Double Glazing Window Handle Window handles come in various styles. They are typically uPVC however they can also be aluminum or wood. They can be cockspurs key locking or cranked. Espagnolette handles are the most common kind of uPVC window handle. They have an elongated spindle on the back which goes into the gearbox of the lock in the window frame. UPVC When selecting a UPVC double glazing window handle, it's important to choose the correct design and size for your windows. There are many manufacturers that offer a variety of ha