This Ivilon tension curtain rod is designed for shower or window use, featuring a heavy-duty tension spring and a 1-inch diameter rod. It has a unique, durable, rustproof black coating suitable for indoor and outdoor use. The rod is constructed with solid metal finials and a thick, heavy build, capable of holding heavier panels thanks to its non-slip, non-scratch, non-marking rubber ends. The adjustable length tension rod bar extends from 24 to 36 inches. It's easy to install with no tools required and can be used for various purposes including shower curtains, doorways, and window curtains.