Compatible with 38 mm diameter poles: this umbrella cone for ring wedge is designed to fit 38 mm poles for a secure, stable fit in your patio umbrella stand. Use: ideal for patio tables, parasols, courtyards, and more. It provides stability and prevents tipping or shaking by wind, keeping your patio umbrella in place. Protects and stabilises: protects your patio from scratches and dents caused by friction. It stabilises the umbrella, helping it stay upright even in windy conditions. Material: made of durable rubber/silicone material for long lasting performance. It is wear resistant and suitable for repeated use. Use scenarios: - With a patio table and umbrella to prevent movement on windy days. - In courtyards or open patios to keep the umbrella upright and surface protected. - In outdoor dining areas to reduce friction between the pole and surface and improve stability.