1. The shower arm and flange weight is 1 lbs. This 18 inch shower arm is too long to take weight photo.

2. Please check the mounting hole size to make sure this shower arm fits.

You could consult your professional contractors about installation. 

3. Heavy-Duty Solid Brass material for both shower arm and escutcheon / flange.

This 18 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.

4. Both sides are Soldered 1/2 NPT Tapered Threads.