Seco Prism Pole Topo Shoe The Seco 5191-00 Prism Pole Topo Shoe provides a stable, durable base for prism poles during topographic and layout work. Constructed from aluminum, it is designed for reliable performance in everyday field conditions. Key Features • Durable aluminum construction • 3.37" (85.6 mm) body for stable ground contact • Ideal for topographic and layout applications