Product Includes: 2 sets(6pcs) of outdoor patio umbrella base replacement parts, including 2pcs 1.5inch umbrella hole ring and 2pcs 1.9inch umbrella hole ring (maybe has been assembled together), 2pcs 40mm M8 threaded screw. Multiple combination 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 ring, meet most umbrella pole diameter needs, matching size will be excellent to tighten 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, thread replacement screws are made of premium black plastic and stainless steel, sturdy and not easy to break. Easy to Install: Choose 2 sizes of the umbrella rings according to the diameters of umbrella poles, insert the umbrella pole into the base, and then tighten the M8 thread screws and fix the umbrella to prevent it from slipping off. For detail steps of installation, please refer to the installed teaching picture. Wide Application: These grommets meet market standard pole diameters; Classic black color can match with all your outdoor furnishings and allow for more space. Can be used on the patio table, beach, backyard, garden, balcony, deck and poolside.