Umbra Coretto 36-Inch-by-54-Inch Tension Rod, BlackUmbra Corretto Tension Rod Designed to fit a range of window sizes, coretto is an adjustable curtain rod (1 2 inch in diameter) that holds up to 10 pounds and extends to fit windows from 24 to 36 inches wide Unlike traditional curtain rods that require you to drill holes and mount hardware, Coretto conveniently mounts on the inside of your window frame and uses tension to adjust to your window width Coretto's slim, metal rod is ideal for sheers, caf