Valmont Model 3B180Q aluminum triple-square-top-mount, bullhorn bracket.; Tenon loading is calculated for weights based on a 100 M.P.H. constant wind with a 1.3 gust factor located 30' above grade. When loading requirements exceed these limits contact your Valmont representative or Valmont Industries, Inc.; 2-3/8" O.D. tenons - other sizes available upon request.; Bracket flush mount on 4", 5" and 6" square poles.