Curtain rods and accessories. This connector is used for glass shower door support rods, connecting the rod to the glass door. The tubing has a 25mm inner diameter, a round design, and is made of 201/304 stainless steel. A variety of sizes and styles are available. Finishes include satin nickel, chrome, matte black, gold, rose gold, and electrophoretic black. We typically use spray painting, electroplating, and PVD finishes.