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Choosing a Double Glazing Window Handle Window handles are available in various styles. They are usually uPVC but they can also be made of aluminium or wood. They can be cockspur, key locking or cranked. The most commonly used uPVC window handles are Espagnolette handles. They feature 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 is crucial to select the appropriate style and size for your windows. The