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Choosing a Double Glazing Window Handle Window handles are available in a variety of styles. They are typically uPVC however they can also be aluminum or wood. They can be cockspurs, key locking or cranked. The most common window handles made of uPVC are Espagnolette handles. They have a square spindle at the back, which is connected to the gearbox of the lock inside the window frame. UPVC It is important to select the proper size and design of UPVC double-glazing window handles for your windows. It is worth l