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Choosing a Handle For Double Glazed Window Double-glazed windows can't be complete without window handles. They can make your home more secure, while also providing a stylish feature. The right handle for your window is difficult, but we're here to help! The most commonly used handle for uPVC Windows is the epag handle. They use the square spindle which operates a lock mechanism inside the window frame. uPVC uPVC, also known as Unplasticised Polyvinylchloride is an ideal material for windows and doors becau