The Andrew MC-RM1030-4 universal ring mount system allows the attachment of a co-location platform, pipe frames, and antenna pipes to monopoles with diameter ranging from 10 – 30 in. This mounting system is a four-sector version. For added durability, these mounting brackets are constructed from hot-dipped galvanized steelbrbrAndrew's four-sector universal ring mount system includes U-bolts. Order pipe support arms separately.