This stand is made of quality steel, strong, durable and corrosion resistant. Height=30cm, diameter=5cm, with 2 additional PVC reducing rings with different diameters (4cm /3.2cm). You can choose the right sleeve according to the diameter of the umbrella, and then adjust the screw knobs on the side to make the umbrella more stable. In this way, the umbrella does not wobble easily even on windy days. The umbrella tube is perfect for umbrellas with a diameter of 32mm-50mm, and thanks to the two adjustable screws, it is also possible to fix a tube with a diameter of about 26mm. The tube also has a beveled sleeve inside to improve the holding of the pole. The base can be made more stable with a 60mm screw and three different types of metal rings. High-quality materials and welding process make the umbrella tube more durable and long-lasting. You can continue to use your original purchased umbrella base, (marble, steel or plastic) without wasting it, just install it and you will have a new umbrella base. Note: The umbrella tube is supplied alone, the umbrella and base are not included. When you receive it, you will see a screw hole on the bottom of the umbrella tube holder. Just connect the sleeve to the other end of the base with the supplied screw and the rest of the accessories and tighten it a little with a wrench. The sturdy umbrella tube holder can be fixed on concrete slabs, granite slabs, iron slabs, wooden tables or marble slabs, etc. It is suitable for both residential and commercial use. It is an ideal partner for cafes, beaches, resort hotels, water parks, barbecue bars, restaurants and other entertainment venues.