Product Description Finish off your shower installation with the GROHE Rainshower Shower Arm in StarLight Chrome for GROHE shower heads. This 6 in. arm features 1/2 in. MNPT threads and is constructed with brass. This piece can be used with any shower head, including Rainshower Jumbo. From the Manufacturer Grohe Rainshower 6-Inch Ceiling Shower Arm in StarLight Chrome # 27 217 000. Product includes 1/2-Inch NPT male threads. Can be used with any shower head including Rainshower Jumbo.