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 8 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 Tapered Threads.

Need indication for choosing a high quality shower arm? How to Choose a High Quality Shower Arm