It's the twist-to-extend type. Weight capacity: 3kg. Extendable. Curtain ring inner diameter: 22mm or more. Please also refer to the measuring tape in the image. I was using this tension rod to hang a shower curtain after removing the closet door. This method is recommended for those who are bothered by the creaking sound when opening and closing the door (noise reduction). Shipping costs will be high because it's very long. Please understand that this is a used item, and only purchase if you accept that I cannot describe or photograph every detail.