As a double rod system I expected these to handle a standard sheer and curtain treatment but the robs are so flimsy I expect they'll be permanently bowed. We were planning to use these at they're longer length but I definitely would not recommend that. Get rods that are longer than what you need so that you have essentially double the thickness with the inner rod providing additional strength. Once you extend them out for a wider window you lose all strength and they'll bow. These are budget-friendly but use only very light curtains, nothing lined or made from heavy fabric.