LightPolesPlus.com RTAB series aluminum light poles are manufactured in the United States and deliver the highest quality available to the commercial and industrial markets. Round-tapered aluminum hinge light poles feature 0.125" to 0.188" shaft construction fabricated from seamless 6063-T6 aluminum extrusion and an anchorage base cast from 356-T6 aluminum alloy and heat treated to a T6 temper after all structural welding is completed. Factory applied finishing options include polyester powdercoat, satin brushed aluminum, anodizing and custom architectural colors.