- Practical Compatibility: Designed to fit standard hole sizes of 3.81 cm and 3.43 cm, this umbrella base adapter adjusts easily to various stand requirements, ensuring optimal stability for your outdoor umbrellas. - Vibration-Reducing Support: Features an innovative gear system that minimizes unwanted movement of the umbrella structure, maintaining pole stability even during simple adjustments. - Durable Outdoor Use: Constructed with weather-resistant components that withstand temperature fluctuations and moisture, ensuring reliable support throughout multiple seasons of regular garden and patio use. - Easy Handling: The threaded knob allows for quick attachment and hassle-free transport with tool-free disassembly. Its precise adjustability ensures pinpoint stabilization during varying weather conditions. Ideal for use in gardens, patios, and outdoor events, this product provides exceptional support for your umbrellas, enhancing your outdoor experience. Enjoy peace of mind knowing your umbrella will remain securely in place, regardless of the weather.