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Choosing a Double Glazing Window Handle Window handles come in different styles. They are usually uPVC but they can also be made of aluminium or timber. They can be cranked, key locking or cockspur. The most common uPVC window handles are Espagnolette handles. They have a square spindle in the back, which is inserted into the gear box of the lock within the window frame. UPVC It is important to select the appropriate size and style of UPVC double-glazing window handles for your windows. It is worthwhile to l