WATER OR SAND FILLING - Base can be weighed down with up to 55 pounds of sand or 19 liters of water, or empty it out for a lightweight stand that can be taken anywhereSTURDY, HIGH-QUALITY MATERIAL - Made of rugged, sturdy HDPE plastic for realistic appeal that lasts for years to come, and includes a solid steel pole tube to place your umbrella insideHOLDS 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 diametersADJUSTABLE KNOB - Tighten the adjustable knob in the steel pipe to ensure optimal strength and stability no matter the umbrella's pole sizeEASY STORAGE - Simply remove the steel tube for a slim design that lets you store the base in a compact space during the winter or any other time neededDIMENSIONSOverall Dimensions - 19.5"(Dia) x 14.5"(H)Pole Opening - 1.5-1.9"(Dia)Weight - 4.6 lbs.SPECIFICATIONS - Material - HDPE Plastic, SteelMaximum Fill Capacity - 55 lbs. (Sand)M