NO TOOLS NEEDED AND STRONG HOLD: Rubber grippers in the end. Can be used on all kinds of surfaces. Can hold weight up to 20 pounds without drilling. With OPTIONAL DRILLING and CENTER SUPPORT HOOK, it can hold weight up to 30 pounds. EXTENDABLE: Designed to fit a range of window sizes, bath tub sizes, room sizes or closet sizes. Come in four sizes: 18"-30", 30"-52", 52"-90" and 90"-120". STURDY AND DURABLE: Meriville Satin Nickel 1" diameter spring tension rod is made of high quality metal so you know it will last. EASY INSTALLATION: Extend and twist. No tools required. Drill free. Without putting holes in your wall.