WATER OR SAND FILLING: Base can be weighed down with up to 55 pounds of sand or 18 liters of water, or empty it out for a lightweight stand that can be taken anywhere STURDY, HIGH-QUALITY MATERIAL: Made of rugged, durable HDPE plastic for realistic appeal that lasts for years to come, and includes a solid steel pole tube to place your umbrella inside HOLDS VARIOUS UMBRELLA SIZES: Versatile base features a steel pipe that accommodates all market umbrellas; ideal for holding most 6-10' umbrellas with 1.5-1.9" pole diameters 2 ADJUSTABLE KNOBS: Tighten the adjustable knobs in the steel pipe to ensure optimal strength and stability no matter the umbrella's pole size EASY STORAGE: Simply remove the steel tube for a slim design that lets you store the base in compact space during the winter and other times of non-use