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Choosing a Double Glazing Window Handle Window handles are available in many different styles. They are usually made of uPVC, but they can also be constructed from wood or aluminum. They can be cockspurs, key locking, or cranked. Espagnolette handles are the most well-known type of uPVC window handles. They feature a square spindle at the back which goes into the gearbox of the lock within the window frame. UPVC When choosing an UPVC double glazing window handle, it's imp