The Brizo Siderna Collection combines geometric designs with flowing curves and squared edges. Siderna captures the merging of all these concepts and creates products that are very appealing. This RP64636BL Siderna Matte Black Shower Arm And Flange are designed for Siderna shower heads only. The Arm and Flange are both covered under Brizo's limited lifetime warranty. The Matte Black finish also includes a superior finishing process that is covered under lifetime warranty.