Decorative Arm-M156 is constructed of Cast Aluminum 356 Alloy. Mount Over Round Poles or Tenons of  3-1/2″, 4”, 4-1/2″, or 5″ OD, DA-M156 and is secured with 3/8” Stainless Steel Set Screws. Contact us for custom configuration or others mounting. All Decorative Arms are Proudly Designed, Fabricated and Assembled in the USA