Usage Tips:THIS IS ONLY fit for Umbrella hole with diameter 2.17 inches, CHECK THE SIZE YOU BUY.Package Includes: 2 sets outdoor patio umbrella base stand , each set contain a 1.5 inch and 1.9 inches umbrella hole ring, a 40 mm long M8 threaded screw. Multi-combination modes could meet most umbrella pole diameter needs, GREAT for stabilizes and aligns patio umbrellas base. Material: the umbrella stand replacement part is mainly made of HDPE plastic, and reusable, sturdy and safe, with high temperature and weather resistance characteristics, threaded knob is made of quality black plastic and stainless steel, not easy to or rust, which can you for a long timeWidely Used: the right combination for your umbrella pole can tightening umbrella pole, effectively reduce umbrella shaking caused by wind, also can prevents scratches and dents on umbrella pole caused by friction. Can used at beaches, backyards, balconies and poolside.Easy to Use: you can 2 sizes of umbrella hole covers according to your different diameter umbrella pole, put tightly to keep the umbrella stable; Then tighten the M8 40 mm thread after installation, and adjust the knob to avoid the umbrella from slipping.Material: plasticcolour: blackPackage Contents:2 Sets x Ring Plug CoverOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.