This base trim collar is designed for use with the 5" balustrade system. The collar installs with the 5" system's square newel post. The trim collar gives the newel a polished and detailed appearance. The base trim collar is crafted in urethane, a high-density polymer material that molds with classic detail. Urethane continues to inspire countless exterior enhancements. Define the exterior space in style when you choose the 5" balustrade system. A diverse selection of system accessories allows for customization and flexibility in creating the detailed balustrade system that you envision.