KES Bathroom Replacement 16-Inch Shower Arm with Large Rainfall Shower Head SQUARE, Polished Chrome, PSAUS4+J316AS8 Industry leading quality finish, build to resist corrosion, scratches and tarnishing. SHOWER ARM UPDATED I/2 NPT Tapered Threads: Wall mount threads have been updated to 1/2 NPT tapered threads now. Standard U.S. connection size, ensuring easy and fast installation. Shower arm size: 16"(L) x 1"(W) x 1"(H) SHOWERHEAD: InstantClean technology - A simple wipe of a finger ensures a like-new water flow. If you have any problems, please contact us for free replacement or refund. Satisfaction guaranteed!