The umbrella stand features a hand-turn tightening knob to help you secure umbrella to the base so you can sit under the umbrella safely.  Enjoy outdoor leisure time with our attractive umbrella base! It is made of selected resin and steel which is not easy to rust crack and deform for years to come. Equipped with 2 adapters the umbrella base perfectly works with 1.5”/1.9” diameter umbrella pole to well suit your different needs. It is an ideal choice for commercial use such as concession s