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Choosing a Double Glazing Window Handle Window handles come in a variety of styles. They are usually made of uPVC, but they can also be made from wood or aluminum. They can be cockspurs key locking or cranked. Espagnolette handles are the most common type of uPVC window handle. They feature a square spindle in the back, which is inserted into the gear box of the lock inside the window frame. UPVC It is crucial to choose the right size and style of UPVC double-glazing window handles to your windows. There are