InterDesign Forma Adjustable Curtain Tension Rod &ndash; Windows, Closets and Blackout Blinds - 30&rdquo; - 52&rdquo;, Medium,  White CONSTANT TENSION: The Curtain rod is held securely in place with patented technology  no slipping. ADJUSTABLE FIT: The tension rod extends to the perfect length for custom windows. SOLID and SECURE: Rust resistant steel and plastic are well built, strong and reliable. NO DRILLING, NO TOOLS: Quick and easy to install  no hardware, just twist and fit! THE INTERDESIGN PROMISE: Bringing you elegant, affordable home products for over 40 years.