The Roadway Arm is constructed of Extruded Aluminum Tubing. Mount over Round Poles or Tenons of 3”, 3-1/2″, 4”, 4-1/2″, or 5″ OD, RWY-A is secured with 3/8” Stainless Steel Set Screws. All Decorative Arms are Proudly Designed, Fabricated, and Assembled in the USA