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Choosing a Double Glazing Window Handle Window handles are available in different styles. They are usually made from uPVC however, they can also be made out of wood or aluminium. They can be locked with keys, cranked or cockspur. The most popular uPVC window handles are Espagnolette handles. They feature a square spindle on the back which goes into the gearbox of the lock in the window frame. UPVC It is essential to choose the proper size and design of UPVC double-glazing window handles to your windows. It is