Our superior quality Black Iron Door knobs come from the high standards you would expect from Cast in Style. The company's we use such as Kirkpatrick, are the "Original" manufactures of Black Iron door furniture and have been making these products for over 150 years. We only supply from the original high quality makes, including our own products. Many of the black iron door knobs are double coated to make them even tougher and resilient to outside conditions.