1. Updated square escutcheon / flange with Anti-Scratch O-Ring structure is the focus of improvement to Aquaiaw square shower arm. Please check the mounting hole size to make sure this shower arm fits. You could consult your professional contractors about installation. 

2. Heavy-Duty Solid Brass material for both shower arm and escutcheon / flange. This 12 inch square shower arm is made of 1 inch X 1 inch solid brass pipe. Flange size is 2.4 inch X 2.4 inch.

3. Both sides are soldered 1/2 NPT threads.