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Choosing a Double Glazing Window Handle Window handles come in various styles. They are usually made from uPVC, but they can also be made from aluminium or wood. They can be cockspurs key locking or cranked. Espagnolette handles are the most common type of uPVC window handles. They feature an elongated spindle on the back, which is connected to the gearbox of the lock within the window frame. UPVC It is crucial to choose the proper size and design of UPVC double-glazing window handles for your windows. It is w