Product Includes: 2 sets (6 pcs) of outdoor patio umbrella base replacement parts, including 2 pcs 1.5 inch umbrella hole ring and 2 pcs 1.9 inch umbrella hole ring (may be assembled together), and 2 pcs 40 mm M8 threaded screw. Multiple combinations can meet most pole diameter needs, ideal for stabilizing and aligning patio umbrella bases. Product Size: 1.5 inch and 1.9 inch outdoor umbrella rings, compatible with most umbrella pole diameters; the matching size helps securely tighten the umbrella pole and protect it from scratches and dents. Premium Material: The umbrella base accessories are made of high-quality plastic, sturdy and durable. Offers good compression resistance, high temperature resistance, and weather resistance for long-lasting use. Threaded screws are made of premium black plastic and stainless steel, providing strong fastening performance and resistance to breakage. Easy to Install: Select the appropriate size of umbrella ring based on the umbrella pole diameter, insert the pole into the base, then tighten the M8 threaded screws to secure the umbrella and prevent slipping. For detailed installation steps, refer to the included instruction image. Wide Application: These grommets are designed to fit standard market pole sizes. The classic black color blends well with various outdoor furnishings and helps save space. Suitable for use with patio tables, and ideal for backyard, garden, balcony, deck, beach, and poolside settings.