Clamp-On AccessoryFits: 1.660 PipeMounts: HorizontalFinish: SilverHeavy duty Clamp-On brackets come ready to mount fixed antennas. These brackets are designed to fit standard size aluminum pipe. Constructed from marine grade aluminum, all brackets are anodized after fabrication for 100% anodized protection. These brackets come standard with bright silver anodized finish. Quickly attached or detached with only an Allen Wrench, they are the perfect retro-fit item.