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Choosing a Double Glazing Window Handle Window handles are available in many different styles. They are typically uPVC but can be aluminium or wood. They can be cranked, key locking or cockspur. The most popular uPVC window handles are Espagnolette handles. They feature an elongated spindle on the back, which is inserted into the gear box of the lock within the window frame. UPVC When choosing a UPVC double glazing window handle, it's important to choose the correct style and size for yo