Luckily one of Vorrezensionisten has mentioned that the shower curtain rings are also at 5 cm thick shower curtain rods. Unfortunately, we had the problem that in the residential community for people with dementia, the shower rods had a diameter larger than standard shower rods and thus commercial shower rings were too small. These rings fit and are easy to install - but I find it a pity that the article description is sche..e!