Product Size: 1.5 inch and 1.9 inch outer umbrella ring, meet most umbrella pole diameter needs, the corresponding 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 durable. With good fixing performance, the replacement wire 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 diameters of the umbrella poles, insert the umbrella pole into the base, then tighten the M8 thread screws and fix the umbrella to prevent it from sliding. Wide Application: These grommets fit standard pole diameters on the market; Classic black color can match all your outdoor furniture and allow more space. Can be used on patio table,