Fits umbrella holes with a diameter of 2.17 inches. Please verify the size before purchase. **Package Includes:** 2 sets of outdoor patio umbrella base stands. Each set includes: - 1.5-inch and 1.9-inch umbrella hole rings - 1 x 40mm M8 threaded screw **Features:** - Multi-combination design fits most umbrella pole diameters - Stabilizes and aligns umbrella bases - Made of durable HDPE plastic, heat and weather resistant - Threaded knob: black plastic + stainless steel (rust-resistant) **Usage:** - Reduces umbrella shaking in wind - Protects poles from scratches and dents - Suitable for beaches, backyards, balconies, and poolside **Installation:** 1. Choose the correct ring size for your umbrella pole. 2. Secure the ring and tighten the M8 screw. 3. Adjust the knob to prevent slipping. **Details:** - Material: Plastic - Color: Black - Package Contents: 2 sets of ring plug covers *Note:* Slight color variations may occur due to lighting/screen differences. Size tolerance: +/- 1-3cm.