STAINLESS STEEL - Heavy duty stainless construction shower arm with flange, 4 inches length for ceiling mounted, and also work as an extender arm, build as a solid body without adaptor to prevent leakage U.S. CONNECTIONS - Standard NPT 1/2 tapered thread (male) to wall/ceiling, G 1/2 straight thread (male) to shower head FINISH - Brushed Stainless finish, like brushed nickel, hand brushed metal texture GUAGE - 15 Guage (1.7mm) thick with 20.5mm outside diameter and 17.1mm inside diameter PACKAGE INCLUDES - 1 x 4 inches straight shower arm, 1 x 2.36x2.36 inches flange.