Grohe Rainshower GR28982000 Shower Arm Features:
 
1/2 inch connection thread
Grohe starlight a radiant chrome finish surfaces that resist both scratches and tarnishing
Constructed from metal
Easy to install and simple to clean
Modern, attractive and fresh design
Suitable for all Rainshower head showers
With circle escutcheon
Comes with an extensive 5 year guarantee from Grohe