Multi-Function Extendable Tension Rods Spring Telescopic Rail Loaded Pole Rod for CurtainsYou only need to twist the tension rod until it is easy to install. Install safely. Will not damage the walls, doors and windows!Specifications: Features: Adjustable, Scalable, Telescopic Material: Aluminum (main body) + Plastic (joint) Size: (30-50 cm, 40-70 cm, 55-90 cm) 30-90 cm / 11.81-35.43 inches (3 different sizes are available) Tube diameter: 1.3 cm / 0.51 inchesPackage Contents 1 * Expandable Spring BarNote: 1. Please understand there may be 1-2 cm deviation exist.2. Due to the lighting and monitors, there are slight difference between the picture and the real item.Promise If the product has any quality problems, please feel free to contact us, we will help you solve the problem as quickly as possible.