Premium material: our window curtain rods are made of stainless steel, are waterproof and rustproof. The matte black curtain rod will give you pleasure for a long time. Curtain rod connection: curtain rods with 16 mm diameter consist of several 40 cm long, screw-in extension poles. There is an additional 19cm pole with finial that will fit your different sized windows. ?Flat end cap? The simple design of the flat end cap differs from the traditional round end cap rod, perfect for all types of tight places and offers a visually unique and modern style. ?Set included? Our curtain rods come with mounting hardware including rods, brackets, screws, anchors and instructions as well as additional plastic rings for noise reduction.