According to the marks, holes are made in the wall and the brackets are attached using dowel screws. It is recommended to install brackets every 50 cm to avoid the rail sagging under heavy curtains. If only light tulle will hang on the rail, then the step can be increased to 100 cm. Additional fittings https://www.friend007.com/read-blog/199370_the-benefits-of-upgrading-your-bathroom-a-wise-investment-for-homeowners.html