Structural Post Block For Horizontal BalusterFor use with Heavy-Duty Structural Post Mount Structural Post Block shown with Heavy Duty Structural Post Mount See More P300 Cellular PVC Posts, Post Sleeves and Accessories P300 Cellular PVC Classic Post Trim P300 Cellular PVC Classic Post Cap P300 Pre-Glued Cellular Post Wrap P300 Classic Post Trim P300 Classic Post Cap Standard Structural Post Mount Heavy-Duty Structural Post Mount P300 Cellular Post Sleeves