Adjustable length: The tension rod with a 5/8-inch diameter and adjustable length from 16 to 39 inches,making them suitable for 16-32 inch window sizes and other spaces. Spring tension: Their strong elasticity ensures a tight and stable fit,providing reliable support for lightweight to medium-weight curtains. Package included: The item includes 2 sets of telescopic rods and outer rods,4 holders,and a set of installation instructions. Rent-friendly: Ideal for renters or anyone seeking a flexible,damage-window treatment solution that combines functionality and ease of use. Easy to install:There is no need for drilling or tools—simply twist to expand and secure into place using spring tension.It should be noted that the shorter the extension,the stronger the load-bearing capacity..