Superior Material :Made from premium Inside and outside tube diameter: 13 and 16 MM Carbon steel5/8-in Diameter sturty and durable Easy to Install :Adjustable Spring Tension Curtain Rod ranges from 28 to 43 inches.no drilling required,does not rust,never collapses,non-corrosive,easy to clean,curtain tension rod Firm Non-slip :Made of Strong Metal materials,Rod with plastic ends,Baked white paint material surface,a strong stretch to extend enough to support the force,bearing is 2 times the ordinary items.you don't have to worry about it slipping or falling Application :Multi-purpose,installed as hanging curtains,curtain,shower curtain,wardrobe bars,door curtain tension rods.