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Choosing a Double Glazing Window Handle Window handles come in a variety of styles. They are typically uPVC but they can also be made of aluminium or timber. They can be cockspur, key locking, or cranked. The most popular uPVC window handles are Espagnolette handles. They have a square spindle at 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 is important to choose the right design and size f