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 RP63797BL Siderna Handle Trim Sleeve Set Screw is designed for Siderna Bidets and Faucets. The Trim Sleeve is covered under Brizo's limited lifetime warranty. The Matte Black finish also includes a superior finishing process that is covered under lifetime warranty.