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Choosing a Double Glazing Window Handle Window handles are available in a variety of styles. They are usually uPVC however they can also be aluminum or timber. They can be cranked, key locking or cockspur. Espagnolette handles are the most common type of uPVC window handle. They feature a square spindle at the back, which is inserted into the gear box of the lock within the window frame. UPVC It is crucial to choose the proper size and design of UPVC double-glazing window handles to your windows. It is worth c