This is a center support for the Toso Roulet Maison 25 curtain rod. It's not an end bracket, but a part that supports the rod in the middle of a double-opening setup to prevent it from sagging under its own weight. It can be installed on any 25mm diameter pole rail. Please refer to the photos for the size. Search for #SuzakuOjiCurtainParts to see other items for sale. Please see my profile for transaction details. Z1 25mm diameter pole ring rail