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Choosing For Double Glazed Window Double glazed windows are not complete without window handles. They can help make your home more secure while adding a beautiful feature. The right handle for your window is difficult, but we are here to help! Espag handles are the most common type of handle found on uPVC windows. They use a spindle square that acts as with a locking mechanism inside the frame of the window. uPVC uPVC (also called Unplasticised Polyvinyl Chloride) is a tough material that is impervious to water damage and other weather conditions. It