1. Please check the mounting hole size to make sure this shower arm fits. You could consult your professional contractors about installation. Any requirement, please send messages to us on Amazon. 2. Heavy-Duty Solid Brass material for both shower arm and escutcheon / flange. This 6 inch round ceiling mount shower arm is made of diameter 15/16 inch solid brass pipe. Flange size is Diameter 2.36 inch X 0.4 inch. 3. Both sides are Soldered 1/2 NPT Tapered Threads. Aquaiaw Shower Arm and O-Ring Flange, 6 inch, Solid Brass, Round, Both Soldered 1/2 NPT Tapered Threads, Straight Shower Arm Extension, Ceiling Shower Head Arm for Rainfall Shower