Spring tension curtain rod consists of 3 parts, 2-part assembly allows for a telescoping range of 70-96 cm, 3-part assembly allows for a telescoping range of 102-128cm.The non-drilled curtain rod is made of high quality high carbon steel. each curtain rod is treated with a baked enamel finish.0.3mm thickness allows the 7/8 inch diameter curtain rod to easily hold up to 10 pounds（5kg）, which means this sturdy curtain rod can hold most curtains.installation instructions are included in our package, just follow the step-by-step diagrams and you can easily install the curtain rod in less than 5 minutes.