Our T1503 tri-sector and T1504 quad-sector series ring mounts provide a solid mounting surface on monopoles ranging from 10" to 60" in diameter. We have ring mounts designed for a specific diameter or you can order our universal ring mounts to cover the entire range. The material is hot dipped galvanized steel. Related products: Kenwood's proprietary snub-nosed platform or any of our other platforms, single or three sector T-arm mounts.