Product includes: 2 sets (6 pcs) umbrella base replacement parts, including 2 pcs 1.5-inch umbrella hole ring and 2 pcs 1.9-inch umbrella hole ring (can be assembled together), 2 pcs 40mm M8 threaded screws. Multiple combinations can meet most pole diameter needs, ideal for stabilizing and adjusting umbrella bases. Product size: 1.5 inches and 1.9 inches outdoor umbrella ring, meets most umbrella pole diameter needs, matching size will be excellent for tightening the umbrella pole; can protect your umbrella from scratches and dents on the umbrella pole. Premium material: The umbrella base accessories are made of high-quality plastic, sturdy and durable. With good extrusion resistance, high temperature resistance, and weather resistance, they are long-lasting. With good fastening performance, the threaded replacement screws are made of premium black plastic and stainless steel, sturdy and not easy to break. Easy to install: Choose 2 sizes of umbrella rings according to the umbrella pole diameter, insert the umbrella pole into the base, then tighten the M8 threaded screws and fix the umbrella to prevent it from slipping. For detailed installation steps, please refer to the included instruction image. Wide range of applications: These grommets meet the market's standard poles; classic black color can match all your outdoor furniture and provide more space. Can be used on patio tables, beaches, backyards, gardens, balconies, decks, and by the pool.