Materials:Stainless Steel, Finish:Satin Stainless Steel 3 in. Diameter Wall Flange for 1-1/2 in. Outside Diameter Tubing The Lido Designs 1-1/2 in. Wall Flange can be used to secure a railing to a wall, and can also be used for light duty floor surface mounts. Fittings are supplied with self-drilling, self-tapping hardware. For use with 1-1/2 in. outside diameter tubing