The Tudor Collection 457mm (18\") Door Hinge Smooth Black Iron works well on rustic, wooden doors. It measures 457mm (18\") long and is sold in pairs, complete with fixings. Smooth Black Iron Hinge The smooth black iron finish does not have deep surface indentations like many other black finishes - this gives it a more modern feel. It is made from malleable cast iron, treated with a zinc phosphating process and then powder coated to provide a durable finish. Other Variations There are also other size variations available and these can be found as separate products in the related products.